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Demonstrate validation of arbitrary fields (e.g., hstore)

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validator.rb
Ruby
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#!/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

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