Skip to content

Instantly share code, notes, and snippets.

@rf-
Created April 6, 2012 19:57
Show Gist options
  • Save rf-/2322543 to your computer and use it in GitHub Desktop.
Save rf-/2322543 to your computer and use it in GitHub Desktop.
Demonstrate validation of arbitrary fields (e.g., hstore)
#!/usr/bin/env ruby
require 'active_record'
ActiveRecord::Base.establish_connection(
:adapter => 'sqlite3',
:database => ':memory:'
)
ActiveRecord::Schema.define do
create_table :documents, :force => true do |t|
end
end
module HstoreValidation
def validates_hstore(field, &block)
validation_class = Class.new do
include ActiveModel::Validations
def self.name
'(validations)'
end
def initialize(data)
@data = data
end
def read_attribute_for_validation(attr_name)
@data[attr_name]
end
end
validation_class.class_eval &block
validate do
validator = validation_class.new(self[field])
if validator.invalid?
validator.errors.each do |attr, text|
self.errors.add(attr, text)
end
end
end
end
end
class Document < ActiveRecord::Base
extend HstoreValidation
validates_hstore :data do
validates_length_of :title, :maximum => 50
end
end
d = Document.new
d[:data] = {title: 'abc' * 51}
p d.valid?
p d.errors
d[:data][:title] = 'shorter title'
p d.valid?
p d.errors
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment