method

conditions

v3.2.1 - Show latest stable - Class: ActiveRecord::Reflection::ThroughReflection

conditions()

public

Consider the following example:

class Person
  has_many :articles
  has_many :comment_tags, :through => :articles
end

class Article
  has_many :comments
  has_many :comment_tags, :through => :comments, :source => :tags
end

class Comment
  has_many :tags
end

There may be conditions on Person.comment_tags, Article.comment_tags and/or Comment.tags, but only Comment.tags will be represented in the #chain. So this method creates an array of conditions corresponding to the chain. Each item in the #conditions array corresponds to an item in the #chain, and is itself an array of conditions from an arbitrary number of relevant reflections, plus any :source_type or polymorphic :as constraints.

# File activerecord/lib/active_record/reflection.rb, line 438
      def conditions
        @conditions ||= begin
          conditions = source_reflection.conditions.map { |c| c.dup }

          # Add to it the conditions from this reflection if necessary.
          conditions.first << options[:conditions] if options[:conditions]

          through_conditions = through_reflection.conditions

          if options[:source_type]
            through_conditions.first << { foreign_type => options[:source_type] }
          end

          # Recursively fill out the rest of the array from the through reflection
          conditions += through_conditions

          # And return
          conditions
        end
      end

conditions

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