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Contents
module ROM class Changeset # Changeset specialization for update commands # # Update changesets will only execute their commands when # the data is different from the original tuple. Original tuple # is fetched from changeset's relation using `one` method. # # @example # users.by_pk(1).changeset(:update, name: "Jane Doe").commit # # @see Changeset::Stateful # # @api public class Update < Stateful command_type :update # Commit update changeset if there's a diff # # This returns original tuple if there's no diff # # @return [Hash] # # @see Changeset#commit # # @api public def commit diff? ? super : original end # Return original tuple that this changeset may update # # @return [Hash] # # @api public def original @original ||= relation.one end # Return true if there's a diff between original and changeset data # # @return [TrueClass, FalseClass] # # @api public def diff? ! diff.empty? end # Return if there's no diff between the original and changeset data # # @return [TrueClass, FalseClass] # # @api public def clean? diff.empty? end # Calculate the diff between the original and changeset data # # @return [Hash] # # @api public def diff @diff ||= begin source = Hash(original) data = pipe.for_diff(__data__) data_tuple = data.to_a data_keys = data.keys & source.keys new_tuple = data_tuple.to_a.select { |k, _| data_keys.include?(k) } ori_tuple = source.to_a.select { |k, _| data_keys.include?(k) } Hash[new_tuple - (new_tuple & ori_tuple)] end end end end end
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4 entries across 4 versions & 1 rubygems