Module: MintyScopes::Associations

Defined in:
lib/minty_scopes/associations.rb

Class Method Summary collapse

Class Method Details

.extended(within) ⇒ Object 



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# File 'lib/minty_scopes/associations.rb', line 4

def self.extended(within)
  within.class_eval do
    # Only show items that have at least one of the associated items
    # Meant for has_many associations
    # Post.with(:comments)
    named_scope :with, lambda { |assoc|
      raise "The 'with' named_scope expects a non-nil argument." if assoc.nil?
      { :joins => assoc.to_sym, :group => "#{quoted_table_name}.id" }
    }
    
    named_scope :without, lambda {|assoc|
      raise "The 'without' named_scope expects a non-nil argument." if assoc.nil?
      { :joins => "LEFT JOIN #{assoc.to_s} "+
          "ON #{quoted_table_name}.id = #{assoc.to_s}.#{quoted_table_name.singularize}_id",
        :conditions => {"#{assoc}.id" => nil} }
    }
    named_scope :including, lambda {|*assocs|
      { :include => assocs.flatten }
    }
    
  end
end