Module: ActiveRecord::AttributeMethods::BeforeTypeCast

Extended by:
ActiveSupport::Concern
Defined in:
lib/active_record/attribute_methods/before_type_cast.rb

Overview

Active Record Attribute Methods Before Type Cast

ActiveRecord::AttributeMethods::BeforeTypeCast provides a way to read the value of the attributes before typecasting and deserialization.

class Task < ActiveRecord::Base
end

task = Task.new(id: '1', completed_on: '2012-10-21')
task.id           # => 1
task.completed_on # => Sun, 21 Oct 2012

task.attributes_before_type_cast
# => {"id"=>"1", "completed_on"=>"2012-10-21", ... }
task.read_attribute_before_type_cast('id')           # => "1"
task.read_attribute_before_type_cast('completed_on') # => "2012-10-21"

In addition to #read_attribute_before_type_cast and #attributes_before_type_cast, it declares a method for all attributes with the *_before_type_cast suffix.

task.id_before_type_cast           # => "1"
task.completed_on_before_type_cast # => "2012-10-21"

Instance Method Summary collapse

Instance Method Details

#attributes_before_type_cast ⇒ Object

Returns a hash of attributes before typecasting and deserialization.

class Task < ActiveRecord::Base
end

task = Task.new(title: nil, is_done: true, completed_on: '2012-10-21')
task.attributes
# => {"id"=>nil, "title"=>nil, "is_done"=>true, "completed_on"=>Sun, 21 Oct 2012, "created_at"=>nil, "updated_at"=>nil}
task.attributes_before_type_cast
# => {"id"=>nil, "title"=>nil, "is_done"=>true, "completed_on"=>"2012-10-21", "created_at"=>nil, "updated_at"=>nil}



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# File 'lib/active_record/attribute_methods/before_type_cast.rb', line 82

def attributes_before_type_cast
  @attributes.values_before_type_cast
end

#attributes_for_database ⇒ Object

Returns a hash of attributes for assignment to the database.



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# File 'lib/active_record/attribute_methods/before_type_cast.rb', line 87

def attributes_for_database
  @attributes.values_for_database
end

#read_attribute_before_type_cast(attr_name) ⇒ Object

Returns the value of the attribute identified by attr_name before typecasting and deserialization.

class Task < ActiveRecord::Base
end

task = Task.new(id: '1', completed_on: '2012-10-21')
task.read_attribute('id')                            # => 1
task.read_attribute_before_type_cast('id')           # => '1'
task.read_attribute('completed_on')                  # => Sun, 21 Oct 2012
task.read_attribute_before_type_cast('completed_on') # => "2012-10-21"
task.read_attribute_before_type_cast(:completed_on)  # => "2012-10-21"



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# File 'lib/active_record/attribute_methods/before_type_cast.rb', line 48

def read_attribute_before_type_cast(attr_name)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  attribute_before_type_cast(name)
end

#read_attribute_for_database(attr_name) ⇒ Object

Returns the value of the attribute identified by attr_name after serialization.

class Book < ActiveRecord::Base
  enum :status, { draft: 1, published: 2 }
end

book = Book.new(status: "published")
book.read_attribute(:status)              # => "published"
book.read_attribute_for_database(:status) # => 2



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# File 'lib/active_record/attribute_methods/before_type_cast.rb', line 65

def read_attribute_for_database(attr_name)
  name = attr_name.to_s
  name = self.class.attribute_aliases[name] || name

  attribute_for_database(name)
end