Module: ActiveTools::ActiveRecord::AdaptiveBelongsTo::ClassMethods

Defined in:
lib/active_tools/active_record/adaptive_belongs_to.rb

Instance Method Summary collapse

Instance Method Details

#adaptive_belongs_to(*args) ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/active_tools/active_record/adaptive_belongs_to.rb', line 48

def adaptive_belongs_to(*args)
  options = args.extract_options!
  assoc_name = args.first
  unless reflection = reflections[assoc_name]
    raise(ArgumentError, ":#{assoc_name} method doesn't look like an association accessor!")
  end
  adapter_name = "#{assoc_name}_adaptive"
  
  raise(TypeError, "Option :attributes must be a Hash. #{options[:attributes].class} passed!") unless options[:attributes].is_a?(Hash)
  attr_map = options.delete(:attributes).with_indifferent_access
       
  valid_with assoc_name, :attributes => attr_map#, :fit => true

  class_attribute :adaptive_options unless defined?(adaptive_options)
  self.adaptive_options ||= {}
  self.adaptive_options[assoc_name.to_sym] = options.merge(:remote_attributes => attr_map.keys)
  
  class_eval <<-EOV
    before_validation do
      #{adapter_name}.try_nullify
    end
  
    #{Rails.version >= "4.1.0" ? "before_validation" : "before_save"} do
      #{adapter_name}.try_commit
    end

    after_save do
      #{adapter_name}.try_destroy_backup
      #{adapter_name}.clear!
    end

    after_destroy do
      #{adapter_name}.try_destroy
    end
  
    def #{adapter_name}
      @#{adapter_name} ||= ActiveTools::ActiveRecord::AdaptiveBelongsTo::Adapter.new(self, :#{assoc_name}, adaptive_options[:#{assoc_name}])
    end
  EOV

  attr_map.each do |remote_attribute, local_attribute|
    relation_options_under(local_attribute, assoc_name => remote_attribute)
    class_eval do
      define_method local_attribute do
        send(adapter_name).read(remote_attribute)
      end
      define_method "#{local_attribute}=" do |value|
        send(adapter_name).write(remote_attribute, value)
      end
    end
  end
  
end

#relation_options_under(*args) ⇒ Object 



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# File 'lib/active_tools/active_record/adaptive_belongs_to.rb', line 13

def relation_options_under(*args)
  path = args.extract_options!
  local_attribute = args.first
  local_method = "#{local_attribute}_relation_options"

  define_singleton_method local_method do |instance = nil|
    outer_values = {}
    where_values = {}
    path.each do |assoc_name, remote_attributes|
      reflection = reflections[assoc_name]
      target = instance.try(reflection.name)
      outer_values[reflection.name] = {}
      Array(remote_attributes).each do |remote_attribute|
        remote_method = "#{remote_attribute}_relation_options"
        if reflection.klass.respond_to?(remote_method)
          deeper = reflection.klass.send(remote_method, target)
          outer_values[reflection.name].merge!(deeper[:outer_values])
          where_values.merge!(deeper[:where_values])
        else
          where_values[reflection.table_name] ||= {}.with_indifferent_access
          where_values[reflection.table_name][remote_attribute] = target.try(remote_attribute)
        end
      end
    end
    {:outer_values => outer_values, :where_values => where_values}
  end
  
  class_eval do
    define_method local_method do
      self.class.send(local_method, self)
    end
  end
  
end