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module WhyValidationsSuckIn96
# A mixin to help handle the most common case of validating a single attribute on an object. This module has a
# dependency on SkippableValidation that will most likely be removed in future releases, but is something to be
# aware of currently.
module AttributeBasedValidation
# An initializer for a validation that checks to see if the required options have been passed for
# attribute based validation to work as expected.
# @param [Object] validatable An object to be validated
# @param [Hash] options The options to set up the validation with
# @option options [Symbol] :attribute The attribute on the validatable object to validate against
# @option options [true, false] :allow_nil If true, skips validation of the value of the attribute is #nil?
# @option options [true, false] :allow_blank If true, skips validation of the value of the attribute is #blank?
def initialize(validatable, options = {})
raise(ArgumentError, "The attribute to validate must be specified as :attribute") unless options[:attribute]
super
end
# The attribute to validate against
def attribute
options[:attribute]
end
# The value of the attribute to validate against
def attribute_value
validatable.send(options[:attribute])
end
# A default validate implementation that skips on #nil?/#blank? attribute values if :allow_nil or :allow_blank
# have been set.
def validate
skip if skip_on_blank? || skip_on_nil?
super
end
private
def skip_on_nil?
options[:allow_nil] && attribute_value.nil?
end
def skip_on_blank?
options[:allow_blank] && attribute_value.blank?
end
end # AttributeBasedValidation
end # WhyValidationsSuckIn96
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15 entries across 15 versions & 1 rubygems