Providing support for the Mysql2 adapter.

test/support/mysql/import_examples.rb

@@ -0,0 +1,117 @@
+def should_support_mysql_import_functionality
+  describe "#import with :on_duplicate_key_update option (mysql specific functionality)" do
+    extend ActiveSupport::TestCase::MySQLAssertions
+  
+    asssertion_group(:should_support_on_duplicate_key_update) do
+      should_not_update_fields_not_mentioned
+      should_update_foreign_keys
+      should_not_update_created_at_on_timestamp_columns
+      should_update_updated_at_on_timestamp_columns
+    end
+  
+    macro(:perform_import){ raise "supply your own #perform_import in a context below" }
+    macro(:updated_topic){ Topic.find(@topic) }
+  
+    context "given columns and values with :validation checks turned off" do
+      let(:columns){  %w( id title author_name author_email_address parent_id ) }
+      let(:values){ [ [ 99, "Book", "John Doe", "john@doe.com", 17 ] ] }
+      let(:updated_values){ [ [ 99, "Book - 2nd Edition", "Author Should Not Change", "johndoe@example.com", 57 ] ] }
+  
+      macro(:perform_import) do |*opts|
+        Topic.import columns, updated_values, opts.extract_options!.merge(:on_duplicate_key_update => update_columns, :validate => false)
+      end
+    
+      setup do
+        Topic.import columns, values, :validate => false
+        @topic = Topic.find 99
+      end
+    
+      context "using string column names" do
+        let(:update_columns){ [ "title", "author_email_address", "parent_id" ] }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using symbol column names" do
+        let(:update_columns){ [ :title, :author_email_address, :parent_id ] }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+    
+      context "using string hash map" do
+        let(:update_columns){ { "title" => "title", "author_email_address" => "author_email_address", "parent_id" => "parent_id" } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using string hash map, but specifying column mismatches" do
+        let(:update_columns){ { "title" => "author_email_address", "author_email_address" => "title", "parent_id" => "parent_id" } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned_with_hash_mappings
+      end
+  
+      context "using symbol hash map" do
+        let(:update_columns){ { :title => :title, :author_email_address => :author_email_address, :parent_id => :parent_id } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using symbol hash map, but specifying column mismatches" do
+        let(:update_columns){ { :title => :author_email_address, :author_email_address => :title, :parent_id => :parent_id } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned_with_hash_mappings
+      end
+    end
+  
+    context "given array of model instances with :validation checks turned off" do
+      macro(:perform_import) do |*opts|
+        @topic.title = "Book - 2nd Edition"
+        @topic.author_name = "Author Should Not Change"
+        @topic.author_email_address = "johndoe@example.com"
+        @topic.parent_id = 57
+        Topic.import [@topic], opts.extract_options!.merge(:on_duplicate_key_update => update_columns, :validate => false)
+      end
+    
+      setup do
+        @topic = Generate(:topic, :id => 99, :author_name => "John Doe", :parent_id => 17)
+      end
+    
+      context "using string column names" do
+        let(:update_columns){ [ "title", "author_email_address", "parent_id" ] }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using symbol column names" do
+        let(:update_columns){ [ :title, :author_email_address, :parent_id ] }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+    
+      context "using string hash map" do
+        let(:update_columns){ { "title" => "title", "author_email_address" => "author_email_address", "parent_id" => "parent_id" } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using string hash map, but specifying column mismatches" do
+        let(:update_columns){ { "title" => "author_email_address", "author_email_address" => "title", "parent_id" => "parent_id" } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned_with_hash_mappings
+      end
+  
+      context "using symbol hash map" do
+        let(:update_columns){ { :title => :title, :author_email_address => :author_email_address, :parent_id => :parent_id } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned
+      end
+  
+      context "using symbol hash map, but specifying column mismatches" do
+        let(:update_columns){ { :title => :author_email_address, :author_email_address => :title, :parent_id => :parent_id } }
+        should_support_on_duplicate_key_update
+        should_update_fields_mentioned_with_hash_mappings
+      end
+    end
+  
+  end
+end