Module: ActiveRecordCompose::AttributeQuerying

Extended by:

ActiveSupport::Concern

Includes:

ActiveModel::AttributeMethods

Included in:

Model

Defined in:

lib/active_record_compose/attribute_querying.rb

Overview

Attribute Querying

This provides predicate methods based on the attributes.

class AccountRegistration < ActiveRecordCompose::Model
  def initialize
    @account = Account.new
    super()
    models << account
  end

  attribute :original_attr
  delegate_attribute :name, :email, to: :account

  private

  attr_reader :account
end

model = AccountRegistration.new

model.name                    #=> nil
model.name?                   #=> false
model.name = 'Alice'
model.name?                   #=> true

model.original_attr = "Bob"
model.original_attr?          #=> true
model.original_attr = ""
model.original_attr?          #=> false

# If the value is numeric, it returns the result of checking whether it is zero or not.
# This behavior is consistent with `ActiveRecord::AttributeMethods::Query`.
model.original_attr = 123
model.original_attr?          #=> true
model.original_attr = 0
model.original_attr?          #=> false