diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..7abff8a
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,283 @@
+# https://evilmartians.com/chronicles/rubocoping-with-legacy-bring-your-ruby-code-up-to-standard
+inherit_mode:
+  merge:
+    - Exclude
+
+inherit_from:
+  - .rubocop/rails.yml
+  - .rubocop_todo.yml
+  - .rubocop/strict.yml
+  # - .rubocop/rspec.yml
+  #  - node_modules/@prettier/plugin-ruby/rubocop.yml
+
+require:
+  - rubocop-performance
+  - rubocop-rake
+  # - rubocop-minitest
+
+AllCops:
+  TargetRubyVersion: 3.2
+  TargetRailsVersion: 7.0
+  SuggestExtensions: false
+  # RuboCop has a bunch of cops enabled by default. This setting tells RuboCop
+  # to ignore them, so only the ones explicitly set in this file are enabled.
+  DisabledByDefault: true
+  Exclude:
+    - 'db/**/*'
+    - 'config/**/*'
+    - 'script/**/*'
+    - '**/Gemfile.lock'
+    - '**/Rakefile'
+    - '**/rails'
+    - '**/vendor/**/*'
+    - '**/spec_helper.rb'
+    - 'node_modules/**/*'
+    - 'bin/*'
+    - !ruby/regexp /old_and_unused\.rb$/
+
+Layout/LineLength:
+  Max: 300
+  AllowedPatterns:
+  - !ruby/regexp /\A#/
+
+# Prefer &&/|| over and/or.
+Style/AndOr:
+  Enabled: true
+
+# Align `when` with `case`.
+Layout/CaseIndentation:
+  Enabled: true
+
+Layout/ClosingHeredocIndentation:
+  Enabled: true
+
+Layout/ClosingParenthesisIndentation:
+  Enabled: true
+
+# Align comments with method definitions.
+Layout/CommentIndentation:
+  Enabled: true
+
+Layout/ElseAlignment:
+  Enabled: true
+
+# Align `end` with the matching keyword or starting expression except for
+# assignments, where it should be aligned with the LHS.
+Layout/EndAlignment:
+  Enabled: true
+  EnforcedStyleAlignWith: variable
+  AutoCorrect: true
+
+Layout/EndOfLine:
+  Enabled: true
+
+Layout/EmptyLineAfterMagicComment:
+  Enabled: true
+
+Layout/EmptyLinesAroundAccessModifier:
+  Enabled: true
+  EnforcedStyle: only_before
+
+Layout/EmptyLinesAroundBlockBody:
+  Enabled: true
+
+# In a regular class definition, no empty lines around the body.
+Layout/EmptyLinesAroundClassBody:
+  Enabled: true
+
+# In a regular method definition, no empty lines around the body.
+Layout/EmptyLinesAroundMethodBody:
+  Enabled: true
+
+# In a regular module definition, no empty lines around the body.
+Layout/EmptyLinesAroundModuleBody:
+  Enabled: true
+
+# Use Ruby >= 1.9 syntax for hashes. Prefer { a: :b } over { :a => :b }.
+Style/HashSyntax:
+  Enabled: true
+
+# Method definitions after `private` or `protected` isolated calls need one
+# extra level of indentation.
+Layout/IndentationConsistency:
+  Enabled: true
+  EnforcedStyle: indented_internal_methods
+  Exclude:
+    - '**/*.md'
+
+# Two spaces, no tabs (for indentation).
+Layout/IndentationWidth:
+  Enabled: true
+
+Layout/LeadingCommentSpace:
+  Enabled: true
+
+Layout/SpaceAfterColon:
+  Enabled: true
+
+Layout/SpaceAfterComma:
+  Enabled: true
+
+Layout/SpaceAfterSemicolon:
+  Enabled: true
+
+Layout/SpaceAroundEqualsInParameterDefault:
+  Enabled: true
+
+Layout/SpaceAroundKeyword:
+  Enabled: true
+
+Layout/SpaceAroundOperators:
+  Enabled: true
+
+Layout/SpaceBeforeComma:
+  Enabled: true
+
+Layout/SpaceBeforeComment:
+  Enabled: true
+
+Layout/SpaceBeforeFirstArg:
+  Enabled: true
+
+Style/DefWithParentheses:
+  Enabled: true
+
+# Defining a method with parameters needs parentheses.
+Style/MethodDefParentheses:
+  Enabled: true
+
+Style/ExplicitBlockArgument:
+  Enabled: true
+
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  EnforcedStyle: never
+  # Exclude:
+  #   - 'actionview/test/**/*.builder'
+  #   - 'actionview/test/**/*.ruby'
+  #   - 'actionpack/test/**/*.builder'
+  #   - 'actionpack/test/**/*.ruby'
+  #   - 'activestorage/db/migrate/**/*.rb'
+  #   - 'activestorage/db/update_migrate/**/*.rb'
+  #   - 'actionmailbox/db/migrate/**/*.rb'
+  #   - 'actiontext/db/migrate/**/*.rb'
+  #   - '**/*.md'
+
+Style/MapToHash:
+  Enabled: true
+
+Style/RedundantFreeze:
+  Enabled: true
+
+# Use `foo {}` not `foo{}`.
+Layout/SpaceBeforeBlockBraces:
+  Enabled: true
+
+# Use `foo { bar }` not `foo {bar}`.
+Layout/SpaceInsideBlockBraces:
+  Enabled: true
+  EnforcedStyleForEmptyBraces: space
+
+# Use `{ a: 1 }` not `{a:1}`.
+Layout/SpaceInsideHashLiteralBraces:
+  Enabled: true
+
+Layout/SpaceInsideParens:
+  Enabled: true
+
+# Check quotes usage according to lint rule below.
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+# Detect hard tabs, no hard tabs.
+Layout/IndentationStyle:
+  Enabled: true
+
+# Empty lines should not have any spaces.
+Layout/TrailingEmptyLines:
+  Enabled: true
+
+# No trailing whitespace.
+Layout/TrailingWhitespace:
+  Enabled: true
+
+# Use quotes for string literals when they are enough.
+Style/RedundantPercentQ:
+  Enabled: true
+
+Lint/AmbiguousOperator:
+  Enabled: true
+
+Lint/AmbiguousRegexpLiteral:
+  Enabled: true
+
+Lint/DuplicateRequire:
+  Enabled: true
+
+Lint/DuplicateMagicComment:
+  Enabled: true
+
+Lint/DuplicateMethods:
+  Enabled: true
+
+Lint/ErbNewArguments:
+  Enabled: true
+
+Lint/EnsureReturn:
+  Enabled: true
+
+# Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
+Lint/RequireParentheses:
+  Enabled: true
+
+Lint/RedundantStringCoercion:
+  Enabled: true
+
+Lint/UriEscapeUnescape:
+  Enabled: true
+
+Lint/UselessAssignment:
+  Enabled: true
+
+Lint/DeprecatedClassMethods:
+  Enabled: true
+
+Style/EvalWithLocation:
+  Enabled: true
+  Exclude:
+    - '**/test/**/*'
+
+Style/ParenthesesAroundCondition:
+  Enabled: true
+
+Style/HashTransformKeys:
+  Enabled: true
+
+Style/HashTransformValues:
+  Enabled: true
+
+Style/RedundantBegin:
+  Enabled: true
+
+Style/RedundantReturn:
+  Enabled: true
+  AllowMultipleReturnValues: true
+
+Style/RedundantRegexpEscape:
+  Enabled: true
+
+Style/Semicolon:
+  Enabled: true
+  AllowAsExpressionSeparator: true
+
+# Prefer Foo.method over Foo::method
+Style/ColonMethodCall:
+  Enabled: true
+
+Style/TrivialAccessors:
+  Enabled: true
+
+# Prefer a = b || c over a = b ? b : c
+Style/RedundantCondition:
+  Enabled: true
diff --git a/.rubocop/markdown.yml b/.rubocop/markdown.yml
new file mode 100644
index 0000000..964e188
--- /dev/null
+++ b/.rubocop/markdown.yml
@@ -0,0 +1,5 @@
+Markdown:
+  # Whether to run RuboCop against non-valid snippets
+  WarnInvalid: false
+  # Whether to lint codeblocks without code attributes
+  Autodetect: false
diff --git a/.rubocop/minitest.yml b/.rubocop/minitest.yml
new file mode 100644
index 0000000..efc4715
--- /dev/null
+++ b/.rubocop/minitest.yml
@@ -0,0 +1,11 @@
+Minitest/AssertRaisesWithRegexpArgument:
+  Enabled: true
+
+Minitest/AssertWithExpectedArgument:
+  Enabled: true
+
+Minitest/SkipEnsure:
+  Enabled: true
+
+Minitest/UnreachableAssertion:
+  Enabled: true
diff --git a/.rubocop/rails.yml b/.rubocop/rails.yml
new file mode 100644
index 0000000..534bc7b
--- /dev/null
+++ b/.rubocop/rails.yml
@@ -0,0 +1,197 @@
+# https://evilmartians.com/chronicles/rubocoping-with-legacy-bring-your-ruby-code-up-to-standard
+# https://gist.github.com/palkan/24869b835c45e89116b9727b534e579e
+require:
+  - rubocop-rails
+
+Rails/ActionFilter:
+  Enabled: true
+  EnforcedStyle: action
+  Include:
+    - app/controllers/**/*.rb
+
+Rails/ActiveRecordAliases:
+  Enabled: true
+
+Rails/ActiveSupportAliases:
+  Enabled: true
+
+Rails/ApplicationJob:
+  Enabled: true
+
+Rails/ApplicationRecord:
+  Enabled: true
+
+Rails/AssertNot:
+  Enabled: true
+  Include:
+    - '**/test/**/*'
+
+Rails/Blank:
+  Enabled: true
+  # Convert usages of `nil? || empty?` to `blank?`
+  NilOrEmpty: true
+  # Convert usages of `!present?` to `blank?`
+  NotPresent: true
+  # Convert usages of `unless present?` to `if blank?`
+  UnlessPresent: true
+
+Rails/BulkChangeTable:
+  Enabled: true
+  Database: null
+  Include:
+    - db/migrate/*.rb
+
+Rails/CreateTableWithTimestamps:
+  Enabled: true
+  Include:
+    - db/migrate/*.rb
+
+Rails/Date:
+  Enabled: true
+  EnforcedStyle: flexible
+
+Rails/Delegate:
+  Enabled: true
+  EnforceForPrefixed: true
+
+Rails/DelegateAllowBlank:
+  Enabled: true
+
+Rails/DynamicFindBy:
+  Enabled: true
+  Whitelist:
+    - find_by_sql
+
+Rails/EnumUniqueness:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/EnvironmentComparison:
+  Enabled: true
+
+Rails/Exit:
+  Enabled: true
+  Include:
+    - app/**/*.rb
+    - config/**/*.rb
+    - lib/**/*.rb
+  Exclude:
+    - lib/**/*.rake
+
+Rails/FilePath:
+  Enabled: true
+  EnforcedStyle: arguments
+
+Rails/FindBy:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/FindEach:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/HasAndBelongsToMany:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/HttpPositionalArguments:
+  Enabled: true
+  Include:
+    - 'spec/**/*'
+    - 'test/**/*'
+
+Rails/HttpStatus:
+  Enabled: true
+  EnforcedStyle: symbolic
+
+Rails/InverseOf:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/LexicallyScopedActionFilter:
+  Enabled: true
+  Safe: false
+  Include:
+    - app/controllers/**/*.rb
+
+Rails/NotNullColumn:
+  Enabled: true
+  Include:
+    - db/migrate/*.rb
+
+Rails/Output:
+  Enabled: true
+  Include:
+    - app/**/*.rb
+    - config/**/*.rb
+    - db/**/*.rb
+    - lib/**/*.rb
+
+Rails/OutputSafety:
+  Enabled: true
+
+Rails/PluralizationGrammar:
+  Enabled: true
+
+Rails/Presence:
+  Enabled: true
+
+Rails/Present:
+  Enabled: true
+  NotNilAndNotEmpty: true
+  NotBlank: true
+  UnlessBlank: true
+
+Rails/ReadWriteAttribute:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/RedundantReceiverInWithOptions:
+  Enabled: true
+
+Rails/RefuteMethods:
+  Enabled: true
+  Include:
+    - '**/test/**/*'
+
+Rails/RelativeDateConstant:
+  Enabled: true
+  AutoCorrect: false
+
+Rails/RequestReferer:
+  Enabled: true
+  EnforcedStyle: referer
+
+Rails/ReversibleMigration:
+  Enabled: true
+  Include:
+    - db/migrate/*.rb
+
+Rails/SafeNavigation:
+  Enabled: true
+  ConvertTry: false
+
+Rails/ScopeArgs:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
+
+Rails/TimeZone:
+  Enabled: true
+  EnforcedStyle: flexible
+
+Rails/UniqBeforePluck:
+  Enabled: true
+  EnforcedStyle: conservative
+  AutoCorrect: false
+
+Rails/Validation:
+  Enabled: true
+  Include:
+    - app/models/**/*.rb
diff --git a/.rubocop/rspec.yml b/.rubocop/rspec.yml
new file mode 100644
index 0000000..7f22ce2
--- /dev/null
+++ b/.rubocop/rspec.yml
@@ -0,0 +1,55 @@
+require:
+  - rubocop-rspec
+
+# Disable all cops by default,
+# only enable those defined explcitly in this configuration file
+RSpec:
+  Enabled: false
+
+RSpec/Focus:
+  Enabled: true
+
+RSpec/EmptyExampleGroup:
+  Enabled: true
+
+RSpec/EmptyLineAfterExampleGroup:
+  Enabled: true
+
+RSpec/EmptyLineAfterFinalLet:
+  Enabled: true
+
+RSpec/EmptyLineAfterHook:
+  Enabled: true
+
+RSpec/EmptyLineAfterSubject:
+  Enabled: true
+
+RSpec/HookArgument:
+  Enabled: true
+
+RSpec/HooksBeforeExamples:
+  Enabled: true
+
+RSpec/ImplicitExpect:
+  Enabled: true
+
+RSpec/IteratedExpectation:
+  Enabled: true
+
+RSpec/LetBeforeExamples:
+  Enabled: true
+
+RSpec/MissingExampleGroupArgument:
+  Enabled: true
+
+RSpec/ReceiveCounts:
+  Enabled: true
+
+RSpec/Capybara/CurrentPathExpectation:
+  Enabled: true
+
+RSpec/FactoryBot/AttributeDefinedStatically:
+  Enabled: true
+
+RSpec/FactoryBot/CreateList:
+  Enabled: true
diff --git a/.rubocop/strict.yml b/.rubocop/strict.yml
new file mode 100644
index 0000000..81a4724
--- /dev/null
+++ b/.rubocop/strict.yml
@@ -0,0 +1,19 @@
+Lint/Debugger: # don't leave binding.pry or debugger
+  Enabled: true
+  Exclude: []
+
+# RSpec/Focus: # run ALL tests on CI
+#   Enabled: true
+#   Exclude: []
+
+Rails/Output: # Don't leave puts-debugging
+  Enabled: true
+  Exclude: []
+
+Rails/FindEach: # each could severely affect the performance, use find_each
+  Enabled: true
+  Exclude: []
+
+Rails/UniqBeforePluck: # uniq.pluck and not pluck.uniq
+  Enabled: true
+  Exclude: []
diff --git a/.solargraph.yml b/.solargraph.yml
new file mode 100644
index 0000000..3d84104
--- /dev/null
+++ b/.solargraph.yml
@@ -0,0 +1,33 @@
+---
+include:
+- "**/*.rb"
+- "./lib/**/*.rb"
+exclude:
+- spec/**/*
+- test/**/*
+- vendor/**/*
+- ".bundle/**/*"
+require:
+- actioncable
+- actionmailer
+- actionpack
+- actionview
+- activejob
+- activemodel
+- activerecord
+- activestorage
+- activesupport
+domains: []
+reporters:
+- typecheck:strict
+# - rubocop
+# - require_not_found
+formatter:
+  rubocop:
+    cops: safe
+    except: []
+    only: []
+    extra_args: []
+require_paths: []
+plugins: []
+max_files: 5000
diff --git a/.yardopts b/.yardopts
new file mode 100644
index 0000000..a632ee2
--- /dev/null
+++ b/.yardopts
@@ -0,0 +1,8 @@
+--protected
+--private
+--embed-mixins
+--debug
+--markup=markdown
+--readme=README.md
+--title='Rails Fields - Ruby API Documentation'
+'lib/**/*.rb' - '*.md'
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..20836f2
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+source "https://rubygems.org"
+
+group :development, :test do
+  gem "yard"
+  gem "rubocop", require: false
+  gem "rubocop-performance", require: false
+  gem "rubocop-rails", require: false
+  gem "rubocop-rake", require: false
+  # gem 'rubocop-minitest', require: false
+
+  gem "solargraph"
+  gem "debug", platforms: %i[mri windows]
+end
+
+# gem "solargraph-rails", "~> 1.1.0"
+
+# gem "graphql"
+# gem "graphiql-rails", group: :development
+
+# gem "formtastic", "~> 4.0"
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..220c4b6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+yard:
+	bundle exec yard doc --protected --private --embed-mixins --debug lib/**/*.rb
+
+start-debug:
+	rdbg --nonstop --open -c -- bin/rails server -p 3050
+
+rubocop-generate:
+	bundle exec rubocop \
+		--auto-gen-config \
+		--auto-gen-only-exclude \
+		--no-exclude-limit