dry-initializer-rails

Rails plugin to dry-initializer

Installation

Add this line to your application's Gemfile:

gem 'dry-initializer-rails'

And then execute:

$ bundle

Or install it yourself as:

$ gem install dry-initializer-rails

Synopsis

The gem provides value coercion to ActiveRecord instances.

Add the :model setting to param or option:

require 'dry-initializer'
require 'dry-initializer-rails'

class CreateOrder
  extend Dry::Initializer

  # Params and options
  param  :customer, model: 'Customer' # use either a name
  option :product,  model: Product    # or a class

  def call
    Order.create customer: customer, product: product
  end
end

Now you can assign values as pre-initialized model instances:

customer = Customer.find(1)
product  = Product.find(2)

order = CreateOrder.new(customer, product: product).call
order.customer # => <Customer @id=1 ...>
order.product  # => <Product @id=2 ...>

...or their ids:

order = CreateOrder.new(1, product: 2).call
order.customer # => <Customer @id=1 ...>
order.product  # => <Product @id=2 ...>

The instance is envoked using method find_by(id: ...). With wrong ids nil values are assigned to a corresponding params and options:

order = CreateOrder.new(0, product: 0).call
order.customer # => nil
order.product  # => nil

You can specify custom key for searching model instance:

require 'dry-initializer-rails'

class CreateOrder
  extend Dry::Initializer

  param  :customer, model: 'User', find_by: 'name'
  option :product,  model: Item,   find_by: :name
end

This time you can pass names (not ids) to the initializer:

order = CreateOrder.new('Andrew', product: 'the_thing_no_123').call

order.customer # => <User @name='Andrew' ...>
order.product  # => <Item @name='the_thing_no_123' ...>

Compatibility

Tested under MRI 2.2+.

Contributing

• Fork the project
• Create your feature branch (git checkout -b my-new-feature)
• Add tests for it
• Commit your changes (git commit -am '[UPDATE] Add some feature')
• Push to the branch (git push origin my-new-feature)
• Create a new Pull Request

License

The gem is available as open source under the terms of the MIT License.