Contents

module ActsAsParanoidDag
  module ModelAdditions

    # This allows you to make your dag paranoid, meaning that connections are not destroyed, 
    # but instead a 'deleted_at' attribute is set.
    # In your DagLink model replace
    # ```
    # class DagLink < ActiveRecord::Base
    #   acts_as_dag_links options
    # end
    #```
    # by
    # ```
    # class DagLink < ActiveRecord::Base
    #   acts_as_dag_links options, paranoid: true
    # end
    #```
    def acts_as_dag_links( params )

      # Find out whether the dag link should have the paranoid extension.
      paranoid = params[ :paranoid ]
      params.delete( :paranoid )

      # Call the original acts_as_dag_links method from the acts-as-dag gem.
      super params

      # If the dag links should be paranoid, load the corresponding extensions.
      if paranoid
        acts_as_paranoid
        include DagLinkInstanceMethods

        scope :now, where( "#{table_name}.deleted_at IS NULL" )

        def now_and_in_the_past
          without_paranoid_default_scope
        end

        def in_the_past
          without_paranoid_default_scope.only_deleted
        end

        def at_time( time )
          links = without_paranoid_default_scope
            .where( "created_at <= ?", time )
          links = links.where( :deleted_at => nil ) + links.where( "deleted_at >= ?", time )
          links
        end

      end
      
    end

    module DagLinkInstanceMethods
      # here the new instance methods for the DagLink model.
    end


#    def has_dag_links( params )
#      
#      paranoid = params[ :paranoid ]
#      params.delete( :paranoid )
#
#      dag_link_class_name = params[ :link_class_name ]
#      dag_link_table_name = dag_link_class_name.constantize.table_name
#
#      super params
#
#      if paranoid
#        
#        scope :now, where( "#{dag_link_table_name}.deleted_at IS NULL" )
#
#      end
#      
#    end

  end
end

ActiveRecord::Base.extend ActsAsParanoidDag::ModelAdditions

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
acts_as_paranoid_dag-0.0.2	lib/acts_as_paranoid_dag/model_additions.rb
acts_as_paranoid_dag-0.0.1	lib/acts_as_paranoid_dag/model_additions.rb