fk: rename `dependent` to `on_delete`

activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb

@@ -24,7 +24,7 @@ def visit_AddForeignKey(o)
 FOREIGN KEY (#{quote_column_name(o.column)})
   REFERENCES #{quote_table_name(o.to_table)} (#{quote_column_name(o.primary_key)})
           SQL
-          sql << " #{dependency_sql(o.dependent)}" if o.dependent
+          sql << " #{action_sql(o.on_delete)}" if o.on_delete
           sql
         end
 
@@ -101,12 +101,11 @@ def options_include_default?(options)
             options.include?(:default) && !(options[:null] == false && options[:default].nil?)
           end
 
-          def dependency_sql(dependency)
+          def action_sql(action = "DELETE", dependency)
             case dependency
-              when :nullify then "ON DELETE SET NULL"
-              when :delete  then "ON DELETE CASCADE"
-              when :restrict then "ON DELETE RESTRICT"
-              else ""
+              when :nullify then "ON #{action} SET NULL"
+              when :cascade  then "ON #{action} CASCADE"
+              when :restrict then "ON #{action} RESTRICT"
             end
           end
       end

activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb

@@ -38,8 +38,8 @@ def primary_key
         options[:primary_key]
       end
 
-      def dependent
-        options[:dependent]
+      def on_delete
+        options[:on_delete]
       end
     end
 

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -654,7 +654,7 @@ def add_foreign_key(from_table, to_table, options = {})
           column: options[:column],
           primary_key: primary_key,
           name: foreign_key_name(from_table, options),
-          dependent: options.fetch(:dependent, nil)
+          on_delete: options.fetch(:on_delete, nil)
         }
         at = create_alter_table from_table
         at.add_foreign_key to_table, options

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -531,8 +531,8 @@ def foreign_keys(table_name)
           }
 
           if create_table_info =~ /CONSTRAINT #{quote_column_name(row['name'])} FOREIGN KEY .* REFERENCES .* ON DELETE (CASCADE|SET NULL|RESTRICT)/
-            options[:dependent] = case $1
-              when 'CASCADE'  then :delete
+            options[:on_delete] = case $1
+              when 'CASCADE'  then :cascade
               when 'SET NULL' then :nullify
               end
           end

activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb

@@ -470,8 +470,8 @@ def foreign_keys(table_name)
               primary_key: row['primary_key']
             }
 
-            options[:dependent] = case row['dependency']
-              when 'c'; :delete
+            options[:on_delete] = case row['dependency']
+              when 'c'; :cascade
               when 'n'; :nullify
               when 'r'; :restrict
               end

activerecord/lib/active_record/schema_dumper.rb

@@ -226,7 +226,7 @@ def foreign_keys(table, stream)
                      'primary_key: ' + foreign_key.primary_key.inspect,
                      'name: ' + foreign_key.name.inspect
                     ]
-            parts << ('dependent: ' + foreign_key.dependent.inspect) if foreign_key.dependent
+            parts << ('on_delete: ' + foreign_key.on_delete.inspect) if foreign_key.on_delete
 
             '  ' + parts.join(', ')
           end

activerecord/test/cases/migration/foreign_key_test.rb

@@ -91,8 +91,8 @@ def test_add_foreign_key_with_non_standard_primary_key
         end
       end
 
-      def test_add_dependent_restrict_foreign_key
-        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", dependent: :restrict
+      def test_add_on_delete_restrict_foreign_key
+        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :restrict
 
         foreign_keys = @connection.foreign_keys("astronauts")
         assert_equal 1, foreign_keys.size
@@ -100,30 +100,30 @@ def test_add_dependent_restrict_foreign_key
         fk = foreign_keys.first
         if current_adapter?(:MysqlAdapter, :Mysql2Adapter)
           # ON DELETE RESTRICT is the default on MySQL
-          assert_equal nil, fk.dependent
+          assert_equal nil, fk.on_delete
         else
-          assert_equal :restrict, fk.dependent
+          assert_equal :restrict, fk.on_delete
         end
       end
 
-      def test_add_dependent_delete_foreign_key
-        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", dependent: :delete
+      def test_add_on_delete_cascade_foreign_key
+        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :cascade
 
         foreign_keys = @connection.foreign_keys("astronauts")
         assert_equal 1, foreign_keys.size
 
         fk = foreign_keys.first
-        assert_equal :delete, fk.dependent
+        assert_equal :cascade, fk.on_delete
       end
 
-      def test_add_dependent_nullify_foreign_key
-        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", dependent: :nullify
+      def test_add_on_delete_nullify_foreign_key
+        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :nullify
 
         foreign_keys = @connection.foreign_keys("astronauts")
         assert_equal 1, foreign_keys.size
 
         fk = foreign_keys.first
-        assert_equal :nullify, fk.dependent
+        assert_equal :nullify, fk.on_delete
       end
 
       def test_remove_foreign_key_inferes_column
@@ -155,11 +155,11 @@ def test_schema_dumping
         assert_match %r{\s+add_foreign_key "fk_test_has_fk", "fk_test_has_pk", column: "fk_id", primary_key: "id", name: "fk_name"$}, output
       end
 
-      def test_schema_dumping_dependent_option
-        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", dependent: :nullify
+      def test_schema_dumping_on_delete_option
+        @connection.add_foreign_key :astronauts, :rockets, column: "rocket_id", on_delete: :nullify
 
         output = dump_table_schema "astronauts"
-        assert_match %r{\s+add_foreign_key "astronauts",.+dependent: :nullify$}, output
+        assert_match %r{\s+add_foreign_key "astronauts",.+on_delete: :nullify$}, output
       end
 
       class CreateCitiesAndHousesMigration < ActiveRecord::Migration