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module ValidatorDetector
class << self
def detect(model, attribute, validator_class)
# a naive implementation based on whether the respective validator
# is in the list of validators for the given attribute
# and whether it is "active" based on the `if` and `unless` options
model._validators[attribute.to_sym].detect do |validator|
validator.class == validator_class &&
validator.attributes.include?(attribute) &&
is_validator_applied?(validator)
end
end
def is_validator_applied?(validator)
#
# NOTE: this isn't foolproof, since the logic of the method (or Proc)
# could depend on the state of the model instance or some other logic
#
# NOTE: also doesn't take into account the "on" conditional (I.e. only when creating or updating the model)
# See http://api.rubyonrails.org/classes/ActiveModel/Validations/ClassMethods.html#method-i-validates
# determine whether the validator has an :if or :unless applied
method = validator.options[:if] || validator.options[:unless]
# next, evaluate the condition to determine whether the validator is active
# NOTE: any errors are ignored, and the default therefore is false
if method.instance_of?(Symbol) || method.instance_of?(String)
# it's a model method, so evalulate within context
self.new().instance_eval do
send(method, self) rescue false
end
elsif method.instance_of?(Proc)
# it's a lambda, so invoke within context
self.new().instance_eval do
method.call(self) rescue false
end
else
# default is applied
true
end
end
end
end
Version data entries
16 entries across 16 versions & 1 rubygems