Class: Mobility::Plugins::ActiveModel::Dirty::HandlerMethodsBuilder

Inherits:
Module
  • Object
show all
Defined in:
lib/mobility/plugins/active_model/dirty.rb

Overview

Module builder which mimics dirty method handlers on a given dirty class. Used to mimic ActiveModel::Dirty and ActiveRecord::Dirty, which have similar but slightly different sets of handler methods. Doing it this way with introspection allows us to support basically all AR/AM versions without changes here.

Constant Summary collapse

PATTERNS_WITH_KWARGS = 
%w[
  %s_changed?
  %s_previously_changed?
  will_save_change_to_%s?
  saved_change_to_%s?
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ HandlerMethodsBuilder

Returns a new instance of HandlerMethodsBuilder.

Parameters:

  • klass (Class) —

    Dirty class to mimic



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# File 'lib/mobility/plugins/active_model/dirty.rb', line 131

def initialize(klass)
  @klass = klass
  define_handler_methods
end

Instance Attribute Details

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/mobility/plugins/active_model/dirty.rb', line 120

def klass
  @klass
end

Instance Method Details

#define_handler_methods ⇒ Object 



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# File 'lib/mobility/plugins/active_model/dirty.rb', line 142

def define_handler_methods
  public_patterns.each do |pattern|
    method_name = pattern % 'attribute'

    kwargs = PATTERNS_WITH_KWARGS.include?(pattern) ? ', **kwargs' : ''
    module_eval <<-EOM, __FILE__, __LINE__ + 1
    def #{method_name}(attr_name, *rest#{kwargs})
      if (mutations_from_mobility.attribute_changed?(attr_name) ||
          mutations_from_mobility.attribute_previously_changed?(attr_name))
        mutations_from_mobility.send(#{method_name.inspect}, attr_name, *rest#{kwargs})
      else
        super
      end
    end
    EOM
  end
end

#each_pattern(attr_name) ⇒ Object 



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# File 'lib/mobility/plugins/active_model/dirty.rb', line 136

def each_pattern(attr_name)
  patterns.each do |pattern|
    yield pattern % attr_name, pattern % 'attribute'
  end
end

#patterns ⇒ Object

Get method suffixes. Creating an object just to get the list of suffixes is simplest given they change from Rails version to version.



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# File 'lib/mobility/plugins/active_model/dirty.rb', line 162

def patterns
  @patterns ||=
    begin
      # Method name changes in Rails 7.1
      attribute_method_patterns = klass.respond_to?(:attribute_method_patterns) ?
        klass.attribute_method_patterns :
        klass.attribute_method_matchers
      attribute_method_patterns.map { |p| "#{p.prefix}%s#{p.suffix}" } - excluded_patterns
    end
end