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# frozen-string-literal: true
module Sequel
module Plugins
# The validation_contexts plugin adds support for a validation_context method inside a validate
# method. You pass in the validation context to use via the :validation_context option to
# Sequel::Model#save && Sequel::Model#valid?:
#
# class Album < Sequel::Model
# plugin :validation_contexts
# def validate
# super
# errors.add(:status_id, 'not 1') if status_id != 1 && validation_context == :initial
# errors.add(:status_id, 'not 2') if status_id != 2 && validation_context == :approve
# end
# end
#
# Album.new(status_id: 1).valid?(validation_context: :initial) # => true
# Album.new(status_id: 2).valid?(validation_context: :initial) # => false
#
# Album.new(status_id: 1).valid?(validation_context: :approve) # => false
# Album.new(status_id: 2).valid?(validation_context: :approve) # => true
#
# There is no validation context used by default, so validation_context will be
# +nil+ if one is not specified. If you want to differentiate between creating new
# objects and updating existing objects, just use +new?+.
#
# Once this plugin is loaded into a model, after you freeze an instance
# of that model, you can no longer specify a validation context when
# validating the instance.
module ValidationContexts
module InstanceMethods
# The validation context to use for the current validation.
# Set via the :validation_context option passed to save/valid?.
attr_reader :validation_context
private
# Set validation context before running validations
def _valid?(opts)
@validation_context = opts[:validation_context] if opts[:validation_context]
super
ensure
@validation_context = nil if @validation_context
end
end
end
end
end
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