Add support to serialized fields with AR 5 (#43)

Appraisals

@@ -13,3 +13,7 @@ end
 appraise "rails42" do
  gem "activerecord", "4.2.3"
 end
+
+appraise "rails50" do
+ gem "activerecord", "5.0.0"
+end

gemfiles/rails50.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activerecord", "5.0.0"
+
+gemspec :path => "../"

lib/polo/sql_translator.rb

@@ -69,7 +69,8 @@ def insert_values(record)
  # wouldn't be properly serialized automatically. That's why explict
  # 'type_cast' call are necessary.
  #
- module ActiveRecordFourOrGreater
+ module ActiveRecordFour
+
  def insert_values(record)
  connection = ActiveRecord::Base.connection
  values = record.send(:arel_attributes_with_values_for_create, record.attribute_names)
@@ -80,10 +81,29 @@ def insert_values(record)
  end
  end
 
+ # Internal: Returns an object's attribute definitions along with
+ # their set values (for Rails >= 5.x).
+ #
+ # Serializers have changed again in rails 5.
+ # We now use the type_caster from the arel_table.
+ #
+ module ActiveRecordFive
+ def insert_values(record)
+ type_caster = record.class.arel_table.send(:type_caster)
+ values = record.send(:arel_attributes_with_values_for_create, record.attribute_names)
+ values.each do |attribute, value|
+ values[attribute] = type_caster.type_cast_for_database(attribute.name, value)
+ end
+ values
+ end
+ end
+
  if ActiveRecord::VERSION::MAJOR < 4
  include ActiveRecordLessThanFour
+ elsif ActiveRecord::VERSION::MAJOR == 4
+ include ActiveRecordFour
  else
- include ActiveRecordFourOrGreater
+ include ActiveRecordFive
  end
  end
 end

spec/polo_spec.rb

@@ -19,7 +19,7 @@
  end
 
  it 'generates insert queries for dependencies' do
- if ActiveRecord::VERSION::STRING.start_with?('4.2')
+ if ActiveRecord::VERSION::STRING >= "4.2"
  serialized_nil = "NULL"
  else
  serialized_nil = "'null'"