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[depot.git] / vendor / rails / activerecord / lib / active_record / associations / has_and_belongs_to_many_association.rb

diff --git a/vendor/rails/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb b/vendor/rails/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
new file mode 100644 (file)
index 0000000..3d68909
--- /dev/null
+++ b/vendor/rails/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
@@ -0,0 +1,121 @@
+module ActiveRecord
+  module Associations
+    class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
+      def create(attributes = {})
+        create_record(attributes) { |record| insert_record(record) }
+      end
+
+      def create!(attributes = {})
+        create_record(attributes) { |record| insert_record(record, true) }
+      end
+
+      protected
+        def construct_find_options!(options)
+          options[:joins]      = @join_sql
+          options[:readonly]   = finding_with_ambiguous_select?(options[:select] || @reflection.options[:select])
+          options[:select]   ||= (@reflection.options[:select] || '*')
+        end
+        
+        def count_records
+          load_target.size
+        end
+
+        def insert_record(record, force=true)
+          if record.new_record?
+            if force
+              record.save!
+            else
+              return false unless record.save
+            end
+          end
+
+          if @reflection.options[:insert_sql]
+            @owner.connection.insert(interpolate_sql(@reflection.options[:insert_sql], record))
+          else
+            columns = @owner.connection.columns(@reflection.options[:join_table], "#{@reflection.options[:join_table]} Columns")
+
+            attributes = columns.inject({}) do |attrs, column|
+              case column.name.to_s
+                when @reflection.primary_key_name.to_s
+                  attrs[column.name] = owner_quoted_id
+                when @reflection.association_foreign_key.to_s
+                  attrs[column.name] = record.quoted_id
+                else
+                  if record.has_attribute?(column.name)
+                    value = @owner.send(:quote_value, record[column.name], column)
+                    attrs[column.name] = value unless value.nil?
+                  end
+              end
+              attrs
+            end
+
+            sql =
+              "INSERT INTO #{@owner.connection.quote_table_name @reflection.options[:join_table]} (#{@owner.send(:quoted_column_names, attributes).join(', ')}) " +
+              "VALUES (#{attributes.values.join(', ')})"
+
+            @owner.connection.insert(sql)
+          end
+
+          return true
+        end
+
+        def delete_records(records)
+          if sql = @reflection.options[:delete_sql]
+            records.each { |record| @owner.connection.delete(interpolate_sql(sql, record)) }
+          else
+            ids = quoted_record_ids(records)
+            sql = "DELETE FROM #{@owner.connection.quote_table_name @reflection.options[:join_table]} WHERE #{@reflection.primary_key_name} = #{owner_quoted_id} AND #{@reflection.association_foreign_key} IN (#{ids})"
+            @owner.connection.delete(sql)
+          end
+        end
+
+        def construct_sql
+          if @reflection.options[:finder_sql]
+            @finder_sql = interpolate_sql(@reflection.options[:finder_sql])
+          else
+            @finder_sql = "#{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.primary_key_name} = #{owner_quoted_id} "
+            @finder_sql << " AND (#{conditions})" if conditions
+          end
+
+          @join_sql = "INNER JOIN #{@owner.connection.quote_table_name @reflection.options[:join_table]} ON #{@reflection.quoted_table_name}.#{@reflection.klass.primary_key} = #{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.association_foreign_key}"
+
+          if @reflection.options[:counter_sql]
+            @counter_sql = interpolate_sql(@reflection.options[:counter_sql])
+          elsif @reflection.options[:finder_sql]
+            # replace the SELECT clause with COUNT(*), preserving any hints within /* ... */
+            @reflection.options[:counter_sql] = @reflection.options[:finder_sql].sub(/SELECT (\/\*.*?\*\/ )?(.*)\bFROM\b/im) { "SELECT #{$1}COUNT(*) FROM" }
+            @counter_sql = interpolate_sql(@reflection.options[:counter_sql])
+          else
+            @counter_sql = @finder_sql
+          end
+        end
+
+        def construct_scope
+          { :find => {  :conditions => @finder_sql,
+                        :joins => @join_sql,
+                        :readonly => false,
+                        :order => @reflection.options[:order],
+                        :include => @reflection.options[:include],
+                        :limit => @reflection.options[:limit] } }
+        end
+
+        # Join tables with additional columns on top of the two foreign keys must be considered ambiguous unless a select
+        # clause has been explicitly defined. Otherwise you can get broken records back, if, for example, the join column also has
+        # an id column. This will then overwrite the id column of the records coming back.
+        def finding_with_ambiguous_select?(select_clause)
+          !select_clause && @owner.connection.columns(@reflection.options[:join_table], "Join Table Columns").size != 2
+        end
+
+      private
+        def create_record(attributes, &block)
+          # Can't use Base.create because the foreign key may be a protected attribute.
+          ensure_owner_is_not_new
+          if attributes.is_a?(Array)
+            attributes.collect { |attr| create(attr) }
+          else
+            build_record(attributes, &block)
+          end
+        end
+    end
+  end
+end