Class: Grape::Validations::Validators::ExceptValuesValidator

Inherits:
Base
  • Object
show all
Defined in:
lib/grape/validations/validators/except_values_validator.rb

Instance Attribute Summary

Attributes inherited from Base

#attrs

Instance Method Summary collapse

Methods inherited from Base

default_message_key, #fail_fast?, inherited, new, #validate, #validate!

Constructor Details

#initialize(attrs, options, required, scope, opts) ⇒ ExceptValuesValidator

Returns a new instance of ExceptValuesValidator.

Raises:

  • (ArgumentError) 


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# File 'lib/grape/validations/validators/except_values_validator.rb', line 9

def initialize(attrs, options, required, scope, opts)
  super
  except = option_value
  raise ArgumentError, 'except_values Proc must have arity of zero (use values: with a one-arity predicate for per-element checks)' if except.is_a?(Proc) && !except.arity.zero?

  # Zero-arity procs (e.g. -> { User.pluck(:role) }) must be called per-request,
  # not at definition time, so they are wrapped in a lambda to defer execution.
  @excepts_call = except.is_a?(Proc) ? except : -> { except }
end

Instance Method Details

#validate_param!(attr_name, params) ⇒ Object 



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# File 'lib/grape/validations/validators/except_values_validator.rb', line 19

def validate_param!(attr_name, params)
  return unless hash_like?(params) && params.key?(attr_name)

  excepts = @excepts_call.call
  return if excepts.nil?

  param_array = params[attr_name].nil? ? [nil] : Array.wrap(params[attr_name])
  return if param_array.none? { |param| excepts.include?(param) }

  validation_error!(attr_name)
end