Class: HasMetadata::Model

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
lib/has_metadata/model.rb

Overview

Base class of the Metadata model. Functionality is moved to this class to make changes to the model easier. See the ‘Metadata` method for more information.

Instance Method Summary collapse

Instance Method Details

#changed_metadata ⇒ Hash<String, Object>

Returns A hash of metadata fields that have been altered.

Returns:

  • (Hash<String, Object>) —

    A hash of metadata fields that have been altered.



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# File 'lib/has_metadata/model.rb', line 70

def changed_metadata
  changed_attributes.except(*attribute_names)
end

#set_fields(fields) ⇒ Object 



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# File 'lib/has_metadata/model.rb', line 17

def set_fields(fields)
  return self if @_fields_set
  @_fields_set = true
  
  singleton_class.send(:define_method, :attribute_method?) do |name|
    name = name.to_sym
    super(name) or fields.include?(name)
  end

  # override attribute prefix/suffix methods to get full first-class
  # property functionality

  singleton_class.send(:define_method, :attribute) do |name|
    name = name.to_sym
    super(name) unless fields.include?(name)

    options = fields[name] || {}
    default = options.include?(:default) ? options[:default] : nil
    data.include?(name) ? data[name] : default
  end
  singleton_class.send :alias_method, :attribute_before_type_cast, :attribute

  singleton_class.send(:define_method, :query_attribute) do |name|
    name = name.to_sym
    super(name) unless fields.include?(name)

    options = fields[name] || {}
    if options.include?(:type) then
      if options[:type].ancestors.include?(Numeric) then
        not send(name).zero?
      else
        not send(name).blank?
      end
    else
      not send(name).blank?
    end
  end

  singleton_class.send(:define_method, :attribute=) do |name, value|
    name = name.to_sym
    super(name, value) unless fields.include?(name)

    options = fields[name] || {}
    data_will_change!
    attribute_will_change! name.to_s
    data[name] = HasMetadata.metadata_typecast(value, options[:type])
  end

  self
end