Module: DataMapper::Validate::ValidatesWithBlock

Included in:
ClassMethods
Defined in:
lib/dm-validations/block_validator.rb

Overview

Author:

  • teamon

Since:

  • 0.9

Instance Method Summary collapse

Instance Method Details

#validates_with_block(*fields, &block) ⇒ Object

Validate using the given block. The block given needs to return:

result::<Boolean>, Error Message::<String>

Examples:

Usage 

require 'dm-validations'

class Page
  include DataMapper::Resource

  property :zip_code, String

  validates_with_block do
    if @zip_code == "94301"
      true
    else
      [false, "You're in the wrong zip code"]
    end
  end

  # A call to valid? will return false and
  # populate the object's errors with "You're in the
  # wrong zip code" unless zip_code == "94301"

  # You can also specify field:

  validates_with_block :zip_code do
    if @zip_code == "94301"
      true
    else
      [false, "You're in the wrong zip code"]
    end
  end

  # it will add returned error message to :zip_code field

Raises:

  • (ArgumentError)

Since:

  • 0.9



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# File 'lib/dm-validations/block_validator.rb', line 46

def validates_with_block(*fields, &block)
  @__validates_with_block_count ||= 0
  @__validates_with_block_count += 1
  # create method and pass it to MethodValidator
  raise ArgumentError.new('You need to pass a block to validates_with_block method') unless block_given?
  method_name = "__validates_with_block_#{@__validates_with_block_count}".to_sym
  define_method(method_name, block)
  opts = opts_from_validator_args(fields)
  opts[:method] = method_name
  add_validator_to_context(opts, fields.empty? ? [method_name] : fields, DataMapper::Validate::MethodValidator)
end