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06-rails-activerecord.html
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<!DOCTYPE html><html lang="en-US"><head><title>Rails - ActiveRecord</title><meta property="og:title" content="Rails - ActiveRecord"><meta name="description" content="Introduccion a Rails"><meta property="og:description" content="Introduccion a Rails"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media 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}article#presentation > svg > foreignObject > section[data-marpit-advanced-background="background"] > div[data-marpit-advanced-background-container] {
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flex-direction: column;
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}article#presentation > svg > foreignObject > section[data-marpit-advanced-background="background"][data-marpit-advanced-background-split="right"] > div[data-marpit-advanced-background-container] {
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flex: auto;
margin: 0;
}article#presentation > svg > foreignObject > section[data-marpit-advanced-background="content"],
article#presentation > svg > foreignObject > section[data-marpit-advanced-background="pseudo"] {
background: transparent !important;
}article#presentation > svg > foreignObject > section[data-marpit-advanced-background="pseudo"],
article#presentation > svg[data-marpit-svg] > foreignObject[data-marpit-advanced-background="pseudo"] {
pointer-events: none !important;
}article#presentation > svg > foreignObject > section[data-marpit-advanced-background-split] {
width: 100%;
height: 100%;
}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button></div><article id="presentation"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-marpit-scope-JnID8Adf="" data-theme="gaia" data-style="code, pre code { background: black}
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section.small-list ul, section.small-list li {
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}
" style="--theme:gaia;
;">
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Ruby on Rails</span></foreignObject></svg></h1>
<p>Parte 2</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
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section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="2" style="--paginate:true;--theme:gaia;
;">
<h1>Agenda</h1>
<ul>
<li>Migraciones</li>
<li>Validaciones y callbacks</li>
<li>Asociaciones</li>
<li>Queries</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
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margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
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section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="3" style="--paginate:true;--theme:gaia;
;" data-marpit-advanced-background="background"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("images/rails-logo.svg");background-size:70%;"></figure></div></section></foreignObject><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
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section.center-image img {
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margin-right: auto;
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section.achicar pre {
margin: 0;
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section.small-list ul, section.small-list li {
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" data-marpit-pagination="3" style="--paginate:true;--theme:gaia;
;" data-marpit-advanced-background="content"></section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="3"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
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section.center-image img {
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}
section.achicar pre {
margin: 0;
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}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="4" style="--paginate:true;--theme:gaia;
;">
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Migraciones</span></foreignObject></svg></h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-class="achicar" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="achicar" data-marpit-pagination="5" style="--paginate:true;--class:achicar;--theme:gaia;
;">
<h1>Migraciones (<a href="https://guides.rubyonrails.org/active_record_migrations.html">docs</a>)</h1>
<p>Crear una nueva tabla:</p>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rails g model Post title:string content:text</span>
create db/migrate/20190724032006_create_posts.rb
create app/models/post.rb
</span></span></foreignObject></svg></code></pre>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">CreatePosts</span> < ActiveRecord::Migration[5.2]</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">change</span></span>
create_table <span class="hljs-symbol">:posts</span> <span class="hljs-keyword">do</span> <span class="hljs-params">|t|</span>
t.string <span class="hljs-symbol">:title</span>
t.text <span class="hljs-symbol">:content</span>
t.timestamps
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-class="achicar" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="achicar" data-marpit-pagination="6" style="--paginate:true;--class:achicar;--theme:gaia;
;">
<h1>Migraciones (up/down)</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">CreateLinks</span> < ActiveRecord::Migration[5.2]</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">up</span></span>
create_table <span class="hljs-symbol">:user_links</span> <span class="hljs-keyword">do</span> <span class="hljs-params">|t|</span>
...
<span class="hljs-keyword">end</span>
add_column <span class="hljs-symbol">:users</span>, <span class="hljs-symbol">:home_page_url</span>, <span class="hljs-symbol">:string</span>
execute <span class="hljs-string"><<-SQL
ALTER TABLE products (...)
SQL</span>
<span class="hljs-keyword">end</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">down</span></span>
execute <span class="hljs-string"><<-SQL
ALTER TABLE products (...)
SQL</span>
remove_column <span class="hljs-symbol">:users</span>, <span class="hljs-symbol">:home_page_url</span>
drop_table <span class="hljs-symbol">:user_links</span>
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-marpit-scope-vlQ68prv="" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="7" style="--paginate:true;--theme:gaia;
;">
<h1>Migraciones</h1>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rails db:migrate</span>
== 20190724032006 CreatePosts: migrating ======================================
-- create_table(:posts) -> 0.0011s
</span></span></foreignObject></svg></code></pre>
<p>Corre todas las migraciones pendientes</p>
<p><code>$ rails db:migrate VERSION=20190724032006</code><br />
Corre las migraciones (hacia arriba o abajo) hasta llegar a la VERSION</p>
<p><code>$ rails db:rollback STEP=3</code><br />
Revierte las últimas 3 migraciones</p>
<p><code>$ rails db:migrate:redo STEP=3</code><br />
Revierte las últimas 3 migraciones y las vuelve a ejecutar</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="8" style="--paginate:true;--theme:gaia;
;">
<h1>Migraciones</h1>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rails generate migration AddPartNumberToProducts part_number:string:index</span>
</span></span></foreignObject></svg></code></pre>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">AddPartNumberToProducts</span> < ActiveRecord::Migration[5.2]</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">change</span></span>
add_column <span class="hljs-symbol">:products</span>, <span class="hljs-symbol">:part_number</span>, <span class="hljs-symbol">:string</span>
add_index <span class="hljs-symbol">:products</span>, <span class="hljs-symbol">:part_number</span>
<span class="hljs-comment"># Otras opciones:</span>
<span class="hljs-comment"># remove_column :products, :part_number, :string</span>
<span class="hljs-comment"># change_column :products, :part_number, :text</span>
<span class="hljs-comment"># add_reference :products, :user, foreign_key: true</span>
<span class="hljs-comment"># create_join_table :products, :categories (many to many)</span>
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="9" style="--paginate:true;--theme:gaia;
;">
<h1>Migraciones: Seed</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-comment"># db/seeds.rb</span>
Admin.create(<span class="hljs-symbol">username:</span> <span class="hljs-string">'admin'</span>, <span class="hljs-symbol">password:</span> <span class="hljs-string">'admin'</span>)
<span class="hljs-keyword">require</span> <span class="hljs-string">"faker"</span> <span class="hljs-comment"># https://github.com/stympy/faker</span>
<span class="hljs-number">10</span>.times <span class="hljs-keyword">do</span>
Book.create({
<span class="hljs-symbol">title:</span> Faker::Book.title,
<span class="hljs-symbol">author:</span> Faker::Book.author
})
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rails db:seeds</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="10" style="--paginate:true;--theme:gaia;
;">
<h1>Migraciones: otros comandos</h1>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rails -T db</span>
rails db:create # Creates the database from config/database.yml [RAILS_ENV]
rails db:drop # Drops the database from config/database.yml [RAILS_ENV]
rails db:migrate # Migrate the database [RAILS_ENV, VERSION]
rails db:migrate:status # Display status of migrations
rails db:rollback # Rolls the schema back to the previous version [STEP=n]
rails db:schema:dump # Creates a db/schema.rb file
rails db:schema:load # Loads a schema.rb file into the database
rails db:seed # Loads the seed data from db/seeds.rb
rails db:setup # Creates the database, loads the schema, and seeds the data
rails db:reset # Idem db:setup, but drop the database first
rails db:version # Retrieves the current schema version number
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="11" style="--paginate:true;--theme:gaia;
;">
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Validaciones</span></foreignObject></svg></h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="12" style="--paginate:true;--theme:gaia;
;">
<h1>Validaciones (<a href="https://guides.rubyonrails.org/active_record_validations.html">docs</a>)</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span> < ApplicationRecord</span>
validates <span class="hljs-symbol">:name</span>, <span class="hljs-symbol">presence:</span> <span class="hljs-literal">true</span>
validates <span class="hljs-symbol">:username</span>, <span class="hljs-symbol">format:</span> { <span class="hljs-symbol">message:</span> <span class="hljs-string">"only letters"</span>, <span class="hljs-symbol">with:</span> /[a-z]{<span class="hljs-number">4</span>,<span class="hljs-number">9</span>}/ }
validate <span class="hljs-symbol">:active_customer</span>, <span class="hljs-symbol">on:</span> <span class="hljs-symbol">:create</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">active_customer</span></span>
errors.add(<span class="hljs-symbol">:customer_id</span>, <span class="hljs-string">"is not active"</span>) <span class="hljs-keyword">unless</span> customer.active?
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="13" style="--paginate:true;--theme:gaia;
;">
<h1>Validaciones</h1>
<pre><code class="language-erb"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="xml">@user = User.create(params)
<span class="hljs-tag"><<span class="hljs-name">%</span></span></span><span class="ruby"> <span class="hljs-keyword">if</span> @user.errors.any? </span><span class="xml"><span class="hljs-tag">%></span>
<span class="hljs-tag"><<span class="hljs-name">div</span> <span class="hljs-attr">id</span>=<span class="hljs-string">"error_explanation"</span>></span>
<span class="hljs-tag"><<span class="hljs-name">h2</span>></span><span class="hljs-tag"><<span class="hljs-name">%=</span></span></span><span class="ruby"> pluralize(@user.errors.count, <span class="hljs-string">"error"</span>) </span><span class="xml"><span class="hljs-tag">%></span> prohibited this user from being saved:<span class="hljs-tag"></<span class="hljs-name">h2</span>></span>
<span class="hljs-tag"><<span class="hljs-name">ul</span>></span>
<span class="hljs-tag"><<span class="hljs-name">%</span></span></span><span class="ruby"> @user.errors.full_messages.each <span class="hljs-keyword">do</span> <span class="hljs-params">|msg|</span> </span><span class="xml"><span class="hljs-tag">%></span>
<span class="hljs-tag"><<span class="hljs-name">li</span>></span><span class="hljs-tag"><<span class="hljs-name">%=</span></span></span><span class="ruby"> msg </span><span class="xml"><span class="hljs-tag">%></span><span class="hljs-tag"></<span class="hljs-name">li</span>></span>
<span class="hljs-tag"><<span class="hljs-name">%</span></span></span><span class="ruby"> <span class="hljs-keyword">end</span> </span><span class="xml"><span class="hljs-tag">%></span>
<span class="hljs-tag"></<span class="hljs-name">ul</span>></span>
<span class="hljs-tag"></<span class="hljs-name">div</span>></span>
<span class="hljs-tag"><<span class="hljs-name">%</span></span></span><span class="ruby"> <span class="hljs-keyword">end</span> </span><span class="xml"><span class="hljs-tag">%></span>
</span></span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-class="small-list" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="small-list" data-marpit-pagination="14" style="--paginate:true;--class:small-list;--theme:gaia;
;">
<h1>Tipos de validaciones</h1>
<ul>
<li>presence</li>
<li>uniqueness</li>
<li>acceptance</li>
<li>inclusion (in: [...])</li>
<li>exclusion (in: [...])</li>
<li>format (with: /regex/)</li>
<li>length (minimum/maximum/...)</li>
<li>numericality (...)</li>
<li>validates_associated</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-class="small-list" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="small-list" data-marpit-pagination="15" style="--paginate:true;--class:small-list;--theme:gaia;
;">
<h1>Tipos de validaciones</h1>
<p>Métodos que realizan validaciones:</p>
<ul>
<li>create / create!</li>
<li>save / save!</li>
<li>update / update!</li>
</ul>
<p>Métodos que NO realizan validaciones:</p>
<ul>
<li>increment! / decrement!</li>
<li>update_all</li>
<li>update_column / update_columns</li>
<li>save(validate: false)</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="16" style="--paginate:true;--theme:gaia;
;">
<h1>Validaciones personalizadas</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Invoice</span> < ApplicationRecord</span>
validate <span class="hljs-symbol">:active_customer</span>, <span class="hljs-symbol">on:</span> <span class="hljs-symbol">:create</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">active_customer</span></span>
errors.add(<span class="hljs-symbol">:customer_id</span>, <span class="hljs-string">"is not active"</span>) <span class="hljs-keyword">unless</span> customer.active?
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="17" style="--paginate:true;--theme:gaia;
;">
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Callbacks</span></foreignObject></svg></h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-class="achicar" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="achicar" data-marpit-pagination="18" style="--paginate:true;--class:achicar;--theme:gaia;
;">
<h1>Callbacks (<a href="https://guides.rubyonrails.org/active_record_callbacks.html">docs</a>)</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span> < ApplicationRecord</span>
validates <span class="hljs-symbol">:username</span>, <span class="hljs-symbol">:email</span>, <span class="hljs-symbol">presence:</span> <span class="hljs-literal">true</span>
after_create <span class="hljs-symbol">:reward_referrer</span>
before_create <span class="hljs-keyword">do</span>
<span class="hljs-keyword">self</span>.name = username.capitalize <span class="hljs-keyword">if</span> name.blank?
<span class="hljs-keyword">end</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">reward_referrer</span></span>
referrer_user.add_credits <span class="hljs-keyword">if</span> referrer_user
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="19" style="--paginate:true;--theme:gaia;
;">
<h1>Callbacks</h1>
<ol>
<li>before_validation</li>
<li>after_validation</li>
<li>before_save</li>
<li>around_save</li>
<li>before_create / before_update</li>
<li>around_create / around_update</li>
<li>after_create / after_update</li>
<li>after_save</li>
<li>after_commit/after_rollback</li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="20" style="--paginate:true;--theme:gaia;
;">
<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Asociaciones</span></foreignObject></svg></h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-paginate="true" data-class="achicar" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" class="achicar" data-marpit-pagination="21" style="--paginate:true;--class:achicar;--theme:gaia;
;">
<h1>Asociaciones (<a href="https://guides.rubyonrails.org/association_basics.html">docs</a>)</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Author</span> < ApplicationRecord;</span> <span class="hljs-keyword">end</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Book</span> < ApplicationRecord;</span> <span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
<p>Creamos un libro de un determinado autor...</p>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>@book = Book.create(<span class="hljs-symbol">published_at:</span> Time.now, <span class="hljs-symbol">author_id:</span> @author.id)
</span></span></foreignObject></svg></code></pre>
<p>Borramos un autor, con todos sus libros...</p>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>@books = Book.where(<span class="hljs-symbol">author_id:</span> @author.id)
@books.each <span class="hljs-keyword">do</span> <span class="hljs-params">|book|</span>
book.destroy
<span class="hljs-keyword">end</span>
@author.destroy
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="22" style="--paginate:true;--theme:gaia;
;">
<h1>Con Rails</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Author</span> < ApplicationRecord</span>
has_many <span class="hljs-symbol">:books</span>, <span class="hljs-symbol">dependent:</span> <span class="hljs-symbol">:destroy</span>
<span class="hljs-keyword">end</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Book</span> < ApplicationRecord</span>
belongs_to <span class="hljs-symbol">:author</span>
<span class="hljs-keyword">end</span>
<span class="hljs-comment"># Crear un libro ...</span>
@book = @author.books.create(<span class="hljs-symbol">published_at:</span> Time.now)
<span class="hljs-comment"># Eliminar un autor...</span>
@author.destroy
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="23" style="--paginate:true;--theme:gaia;
;">
<h1>Tipos de Asociaciones</h1>
<ol>
<li><code>belongs_to</code></li>
<li><code>has_one</code></li>
<li><code>has_many</code></li>
<li><code>has_many :through</code></li>
<li><code>has_one :through</code></li>
<li><code>has_and_belongs_to_many</code></li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="24" style="--paginate:true;--theme:gaia;
;">
<h1><code>belongs_to</code></h1>
<p><img src="./images/belongs_to.png" alt="" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
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section.small-list ul, section.small-list li {
margin-top: 0;
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" data-marpit-pagination="25" style="--paginate:true;--theme:gaia;
;">
<h1><code>has_one</code></h1>
<p><img src="./images/has_one.png" alt="" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
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color: black;
border: 1px solid black
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section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="26" style="--paginate:true;--theme:gaia;
;">
<h1><code>has_many</code></h1>
<p><img src="./images/has_many.png" alt="" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="27" style="--paginate:true;--theme:gaia;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/has_many_through.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="27" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="27" style="--paginate:true;--theme:gaia;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h2><code>has_many :through</code></h2>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="27"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="28" style="--paginate:true;--theme:gaia;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("./images/has_one_through.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="28" data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);
}
section.small-list ul, section.small-list li {
margin-top: 0;
}
" data-marpit-pagination="28" style="--paginate:true;--theme:gaia;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h2><code>has_one :through</code></h2>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo" data-marpit-pagination="28"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-paginate="true" data-theme="gaia" data-style="code, pre code { background: black}
h1 code, h2 code, h3 code {
background: #fff8e1;
color: black;
border: 1px solid black
}
section.center-image img {
display: block;
margin-left: auto;
margin-right: auto;
}
section.achicar pre {
margin: 0;
transform: scaleY(0.9);