diff --git a/.gitignore b/.gitignore
index dcf7be9..a1871cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 Gemfile.lock
 pkg
 tmp
+/coverage/
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index 3c887d1..c5c403e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,9 +4,13 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'rake'
+gem 'simplecov', require: false
+gem 'railties'
 
 unless defined?(Appraisal)
   gem 'appraisal', require: false
+  gem 'sqlite3', '~>1.4'
+  gem 'pry-byebug'
 
   group :lint do
     gem 'rubocop'
diff --git a/gemfiles/rails_61.gemfile b/gemfiles/rails_61.gemfile
index c47e654..cac9102 100644
--- a/gemfiles/rails_61.gemfile
+++ b/gemfiles/rails_61.gemfile
@@ -3,6 +3,8 @@
 source "https://rubygems.org"
 
 gem "rake"
+gem "simplecov", require: false
+gem "railties"
 gem "activerecord", "~>6.1.5"
 gem "sqlite3", "~>1.4"
 
diff --git a/gemfiles/rails_61.gemfile.lock b/gemfiles/rails_61.gemfile.lock
index fcb3c44..b325fc1 100644
--- a/gemfiles/rails_61.gemfile.lock
+++ b/gemfiles/rails_61.gemfile.lock
@@ -36,12 +36,14 @@ GEM
     concurrent-ruby (1.2.3)
     crass (1.0.6)
     diff-lcs (1.5.1)
+    docile (1.4.0)
     erubi (1.12.0)
     i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     loofah (2.22.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
+    method_source (1.1.0)
     minitest (5.22.3)
     mysql2 (0.5.6)
     nokogiri (1.16.4-arm64-darwin)
@@ -60,6 +62,12 @@ GEM
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
+    railties (6.1.7.7)
+      actionpack (= 6.1.7.7)
+      activesupport (= 6.1.7.7)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
     rake (13.2.1)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
@@ -74,7 +82,14 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.1)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
     sqlite3 (1.7.3-arm64-darwin)
+    thor (1.3.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     zeitwerk (2.6.13)
@@ -88,9 +103,11 @@ DEPENDENCIES
   activerecord (~> 6.1.5)
   mysql2
   pg
+  railties
   rake
   rspec (>= 2.0)
   seamless_database_pool!
+  simplecov
   sqlite3 (~> 1.4)
 
 BUNDLED WITH
diff --git a/gemfiles/rails_70.gemfile b/gemfiles/rails_70.gemfile
index f89b9d0..d971e1e 100644
--- a/gemfiles/rails_70.gemfile
+++ b/gemfiles/rails_70.gemfile
@@ -3,6 +3,8 @@
 source "https://rubygems.org"
 
 gem "rake"
+gem "simplecov", require: false
+gem "railties"
 gem "activerecord", "~>7.0.4"
 gem "sqlite3", "~>1.4"
 
diff --git a/gemfiles/rails_70.gemfile.lock b/gemfiles/rails_70.gemfile.lock
index 8be57c8..ba3f072 100644
--- a/gemfiles/rails_70.gemfile.lock
+++ b/gemfiles/rails_70.gemfile.lock
@@ -35,12 +35,14 @@ GEM
     concurrent-ruby (1.2.3)
     crass (1.0.6)
     diff-lcs (1.5.1)
+    docile (1.4.0)
     erubi (1.12.0)
     i18n (1.14.4)
       concurrent-ruby (~> 1.0)
     loofah (2.22.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
+    method_source (1.1.0)
     minitest (5.22.3)
     mysql2 (0.5.6)
     nokogiri (1.16.4-arm64-darwin)
@@ -59,6 +61,13 @@ GEM
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
+    railties (7.0.8.1)
+      actionpack (= 7.0.8.1)
+      activesupport (= 7.0.8.1)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
+      zeitwerk (~> 2.5)
     rake (13.2.1)
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
@@ -73,9 +82,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.1)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
     sqlite3 (1.7.3-arm64-darwin)
+    thor (1.3.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    zeitwerk (2.6.13)
 
 PLATFORMS
   arm64-darwin-22
@@ -86,9 +103,11 @@ DEPENDENCIES
   activerecord (~> 7.0.4)
   mysql2
   pg
+  railties
   rake
   rspec (>= 2.0)
   seamless_database_pool!
+  simplecov
   sqlite3 (~> 1.4)
 
 BUNDLED WITH
diff --git a/lib/active_record/connection_adapters/seamless_database_pool_adapter.rb b/lib/active_record/connection_adapters/seamless_database_pool_adapter.rb
index d4cd989..5f55449 100755
--- a/lib/active_record/connection_adapters/seamless_database_pool_adapter.rb
+++ b/lib/active_record/connection_adapters/seamless_database_pool_adapter.rb
@@ -12,6 +12,9 @@ def seamless_database_pool_connection(config)
         default_config.delete(:pool_adapter)
 
         master_config = default_config.merge(config[:master]).with_indifferent_access
+        if (url = master_config.delete(:url))
+          master_config.merge!(ActiveRecord::DatabaseConfigurations::ConnectionUrlResolver.new(url).to_hash)
+        end
         establish_adapter(master_config[:adapter])
         master_connection = send("#{master_config[:adapter]}_connection".to_sym, master_config)
         pool_weights[master_connection] = master_config[:pool_weight].to_i if master_config[:pool_weight].to_i > 0
@@ -21,6 +24,9 @@ def seamless_database_pool_connection(config)
         read_connections = []
         config[:read_pool].each_with_index do |read_config, i|
           read_config = default_config.merge(read_config).with_indifferent_access
+          if (url = read_config.delete(:url))
+            master_config.merge!(ActiveRecord::DatabaseConfigurations::ConnectionUrlResolver.new(url).to_hash)
+          end
           read_config[:pool_weight] = read_config[:pool_weight].to_i
           if read_config[:pool_weight] > 0
             begin
@@ -146,6 +152,7 @@ def adapter_class(master_connection)
         end
 
         # Set the arel visitor on the connections.
+        # unused in modern rails (was used in around rails 3)? looks being replaced by `connection.arel_visitor`
         def visitor_for(pool)
           # This is ugly, but then again, so is the code in ActiveRecord for setting the arel
           # visitor. There is a note in the code indicating the method signatures should be updated.
diff --git a/lib/seamless_database_pool.rb b/lib/seamless_database_pool.rb
index ddd782d..686c1dc 100644
--- a/lib/seamless_database_pool.rb
+++ b/lib/seamless_database_pool.rb
@@ -150,8 +150,8 @@ def master_database_configuration(database_configs)
           { adapter: new_conf[:pool_adapter] }
         )
 
-        if conf.respond_to?(:url)
-          ActiveRecord::DatabaseConfigurations::UrlConfig.new(conf.env_name, conf.name, conf.url, new_conf)
+        if conf.respond_to?(:url) && (url = conf.url) || url = new_conf.delete(:url)
+          ActiveRecord::DatabaseConfigurations::UrlConfig.new(conf.env_name, conf.name, url, new_conf)
         else
           ActiveRecord::DatabaseConfigurations::HashConfig.new(conf.env_name, conf.name, new_conf)
         end
diff --git a/lib/seamless_database_pool/arel_compiler.rb b/lib/seamless_database_pool/arel_compiler.rb
index 11654ab..e27b8a2 100644
--- a/lib/seamless_database_pool/arel_compiler.rb
+++ b/lib/seamless_database_pool/arel_compiler.rb
@@ -1,3 +1,4 @@
+# is it used?
 module Arel
   module SqlCompiler
     # Hook into arel to use the compiler used by the master connection.
diff --git a/spec/controller_filter_spec.rb b/spec/controller_filter_spec.rb
index 9440c55..c5514e0 100644
--- a/spec/controller_filter_spec.rb
+++ b/spec/controller_filter_spec.rb
@@ -86,7 +86,9 @@ def read
 RSpec.describe SeamlessDatabasePool::ControllerFilter do
 
   let(:session){Hash.new}
-  let(:controller){SeamlessDatabasePool::TestOtherController.new(session)}
+  let(:base_controller_class) { SeamlessDatabasePool::TestBaseController }
+  let(:controller_class) { SeamlessDatabasePool::TestOtherController }
+  let(:controller) { controller_class.new(session) }
 
   it "should work with nothing set" do
     controller = SeamlessDatabasePool::TestApplicationController.new(session)
@@ -96,6 +98,7 @@ def read
   it "should allow setting a connection type for a single action" do
     controller = SeamlessDatabasePool::TestBaseController.new(session)
     expect(controller.process('read')).to eq :persistent
+    expect(controller.process('other')).to eq :master
   end
 
   it "should allow setting a connection type for actions" do
@@ -123,6 +126,19 @@ def read
     expect(controller.process('read')).to eq :persistent
   end
 
+  context "when set unknown method" do
+    let(:controller_class) do
+      Class.new(base_controller_class) do
+        use_database_pool({ base_action: :lala_foo })
+      end
+    end
+
+    it "raises" do
+      # expect(controller.send(:process_action, 'base_action')).to eq :persistent
+      expect { controller.send(:process_action, 'base_action') }.to raise_error(/Invalid read pool method/)
+    end
+  end
+
   it "should not break trying to force the master connection if sessions are not enabled" do
     expect(controller.process('read')).to eq :persistent
     controller.use_master_db_connection_on_next_request
diff --git a/spec/railtie_spec.rb b/spec/railtie_spec.rb
new file mode 100644
index 0000000..c801f9e
--- /dev/null
+++ b/spec/railtie_spec.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+require 'rails'
+require 'active_record/railtie'
+require 'seamless_database_pool/railtie'
+
+class DummyApp < Rails::Application
+end
+
+RSpec.describe SeamlessDatabasePool::Railtie do
+  it "installs log subscriber" do
+    described_class.initializers.each(&:run)
+    # expect ?
+  end
+
+
+  it "installs rake task" do
+    require 'rake'
+    require 'rake/testtask'
+
+    Rails.application.load_tasks
+    expect(Rake.application["db:load_config"].actions.map(&:source_location).map(&:first)).to include(/seamless_database_pool/)
+
+    ActiveRecord::Tasks::DatabaseTasks.database_configuration = {}
+    Rake.application["db:load_config"].invoke
+    ActiveRecord::Base.configurations
+  end
+end
diff --git a/spec/seamless_database_pool_adapter_spec.rb b/spec/seamless_database_pool_adapter_spec.rb
index 5505a20..b92a43e 100755
--- a/spec/seamless_database_pool_adapter_spec.rb
+++ b/spec/seamless_database_pool_adapter_spec.rb
@@ -74,6 +74,43 @@ def columns(table_name, name = nil); end
     expect(conn).to eq pool_connection
   end
 
+  it "should support urls in config" do
+    options = {
+      adapter: 'seamless_database_pool',
+      pool_adapter: 'reader',
+      username: 'user',
+      master: {
+        url: 'writer://master-host'
+      },
+      read_pool: [
+        {'host' => 'read_host_1'},
+        {'host' => 'read_host_2', 'pool_weight' => '2'},
+        { 'url' => 'reader://read-host-3', 'pool_weight' => '0' }
+      ]
+    }
+
+    pool_connection = double(:connection)
+    master_connection = SeamlessDatabasePool::MockConnection.new("master")
+    read_connection_1 = SeamlessDatabasePool::MockConnection.new("read_1")
+    read_connection_2 = SeamlessDatabasePool::MockConnection.new("read_2")
+    logger = ActiveRecord::Base.logger
+    weights = {master_connection => 1, read_connection_1 => 1, read_connection_2 => 2}
+
+    expect(ActiveRecord::Base).to receive(:writer_connection).with({'adapter' => 'writer', 'host' => 'master-host', 'username' => 'user', 'pool_weight' => 1}).and_return(master_connection)
+    expect(ActiveRecord::Base).to receive(:reader_connection).with({'adapter' => 'reader', 'host' => 'read_host_1', 'username' => 'user', 'pool_weight' => 1}).and_return(read_connection_1)
+    expect(ActiveRecord::Base).to receive(:reader_connection).with({'adapter' => 'reader', 'host' => 'read_host_2', 'username' => 'user', 'pool_weight' => 2}).and_return(read_connection_2)
+
+    klass = double(:class)
+    expect(ActiveRecord::ConnectionAdapters::SeamlessDatabasePoolAdapter).to receive(:adapter_class).with(master_connection).and_return(klass)
+    expect(klass).to receive(:new).with(nil, logger, master_connection, [read_connection_1, read_connection_2], weights, options).and_return(pool_connection)
+
+    expect(ActiveRecord::Base).to receive(:establish_adapter).with('writer')
+    expect(ActiveRecord::Base).to receive(:establish_adapter).with('reader').twice
+
+    conn = ActiveRecord::Base.seamless_database_pool_connection(options)
+    expect(conn).to eq pool_connection
+  end
+
   it "should raise an error if the adapter would be recursive" do
     expect do
       ActiveRecord::Base.seamless_database_pool_connection({ master: { adapter: 'seamless_database_pool' } })
diff --git a/spec/seamless_database_pool_spec.rb b/spec/seamless_database_pool_spec.rb
index 96d8995..9eee702 100644
--- a/spec/seamless_database_pool_spec.rb
+++ b/spec/seamless_database_pool_spec.rb
@@ -191,7 +191,12 @@
             shard_replica:
               pool_adapter: mysql2
               database: dev_db_shard
-              replica: true            
+              replica: true
+            with_url:
+              adapter: seamless_database_pool
+              pool_adapter: mysql2
+              master:
+                url: mysql2://localhost:1234
           test:
             adapter: mysql2
             database: test_db
@@ -200,7 +205,7 @@
 
       it "should pull out the master configurations for compatibility with rake db:* tasks" do
         expect(master_database_configuration).to be_a(ActiveRecord::DatabaseConfigurations)
-        expect(master_database_configuration.configurations.size).to eq(3) # except replica
+        expect(master_database_configuration.configurations.size).to eq(4) # except replica
 
         expect(master_database_configuration.configs_for(env_name: 'development').map(&:configuration_hash)).to eq([
           {
@@ -215,6 +220,11 @@
             migrations_paths: 'db/migrate_shards',
             database_tasks: true,
             schema_dump: false
+          },
+          {
+            adapter: 'mysql2',
+            host: 'localhost',
+            port: 1234
           }
         ])
         expect(master_database_configuration.configs_for(env_name: 'test').map(&:configuration_hash)).to eq([{
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index eb60b87..39f60e2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,12 @@
 require 'rubygems'
 
+if ENV['COVERAGE']
+  require 'simplecov'
+  SimpleCov.start do
+    add_filter 'spec'
+  end
+end
+
 require 'active_record'
 puts "Testing Against ActiveRecord #{ActiveRecord::VERSION::STRING} on Ruby #{RUBY_VERSION}" if defined?(ActiveRecord::VERSION)