Class: Croesus::Validator::LambdaValidator

Inherits:
Base show all
Defined in:
lib/croesus/validators/lambda_validator.rb

Overview

Author: Stefano Harding <riddopic@gmail.com>

Copyright © 2014 Stefano Harding

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Instance Attribute Summary

Attributes inherited from Base

#name

Instance Method Summary collapse

Constructor Details

#initializeLambdaValidator

Returns a new instance of LambdaValidator.


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# File 'lib/croesus/validators/lambda_validator.rb', line 21

def initialize
  super('_lambda')  # The name of the validator, underscored as it won't usually be directly invoked (invoked through use of validator)
end

Instance Method Details

#presence_error_messageObject


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# File 'lib/croesus/validators/lambda_validator.rb', line 40

def presence_error_message
  'is not valid'
end

#should_validate?(item) ⇒ Boolean

Returns:


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# File 'lib/croesus/validators/lambda_validator.rb', line 25

def should_validate?(item)
  if item.is_a?(Proc)
    if item.arity == 1
      true
    else
      raise InvalidArgumentCount.new(
        "Lambda validator should only accept one argument; " \
        "supplied lambda accepts #{item.arity}."
      )
    end
  else
    false
  end
end

#validate(key, value, lambda, errors) ⇒ Object


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# File 'lib/croesus/validators/lambda_validator.rb', line 44

def validate(key, value, lambda, errors)
  unless lambda.call(value)
    errors[key] = presence_error_message
  end

rescue
  errors[key] = presence_error_message
end