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# frozen_string_literal: true
module Torque
module PostgreSQL
module Relation
module DistinctOn
# :nodoc:
def distinct_on_values; get_value(:distinct_on); end
# :nodoc:
def distinct_on_values=(value); set_value(:distinct_on, value); end
# Specifies whether the records should be unique or not by a given set
# of fields. For example:
#
# User.distinct_on(:name)
# # Returns 1 record per distinct name
#
# User.distinct_on(:name, :email)
# # Returns 1 record per distinct name and email
#
# User.distinct_on(false)
# # You can also remove the uniqueness
def distinct_on(*value)
spawn.distinct_on!(*value)
end
# Like #distinct_on, but modifies relation in place.
def distinct_on!(*value)
self.distinct_on_values = value
self
end
private
# Hook arel build to add the distinct on clause
def build_arel(*)
arel = super
value = self.distinct_on_values
arel.distinct_on(resolve_column(value)) if value.present?
arel
end
end
end
end
end
Version data entries
31 entries across 31 versions & 1 rubygems