Hello,
I’ve always felt the needing of a method which negates an ActiveRecord relation. Consider the following use case:
class Content < ApplicationRecord scope :published, → { where(status: :publication).where(arel_table[:published_at].lteq ‘NOW()’ } scope :not_published, → { where.not(status: :publication).or(where(arel_table[:published_at].gt ‘NOW()’) } end
with an ActiveRecord::Relation#negate method, the unpublished scope would just be something like
scope :not_published, → { where published.negate }
I’m somehow already using a negation based on an ActiveRecord::Relation instance, which is
scope :not_published, → { where public.where_clause.invert.ast }
But can be used only when there are no values for prepared statements, otherwise it raises the following error:
ActiveRecord::StatementInvalid: PG::ProtocolViolation: ERROR: bind message supplies 0 parameters, but prepared statement “” requires 1 : SELECT “contents”.* FROM “contents” WHERE (NOT ((“contents”.“status” != $1)))
