Class: PolymorphicAssociationInput

Inherits:
SimpleForm::Inputs::Base
  • Object
show all
Defined in:
app/inputs/polymorphic_association_input.rb

Instance Method Summary collapse

Instance Method Details

#input(wrapper_options = nil) ⇒ Object

Example:

In this example an achievement belongs to an achiever (polymorphic). To make this work you will need four things:

  1. A controller action for models that are candidates for the polymorphic association.

  2. Routing for these controllers

  3. Properly configured models that the controller will query.

  4. The form input in the form of the model on the belongs_to side of the polymorphic association.

First, setup the controller:

# app/controllers/people_controller.rb
class PeopleController < ApplicationController
  include SimpleFormPolymorphicAssociations::AutocompleteConcern
end

Then add the routing:

# config/routes.rb
Rails.application.routes.draw do
  resources :people do
    get :autocomplete, on: :collection
  end
end

Configure your model to support autocompletion:

# app/models/person.rb
class Person < ActiveRecord::Base
  include SimpleFormPolymorphicAssociations::AutocompleteConcern
  autocomplete scope: ->(matcher) { where("people.firstname LIKE :term", term: "%#{matcher.downcase}%") }, id_method: :id, text_method: :human
end

Yo will need to repeat these first three steps for every model that the can be attached to the polymorphic association.

Finally add the input field to the form:

# app/views/achievements/form.html.haml
= form.input :achiever, as: :polymorphic_association, classes: { Person => url_for([:autocomplete, Person]), SomeOtherModel => url_for([:autocomplete, SomeOtherModel]) }



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# File 'app/inputs/polymorphic_association_input.rb', line 46

def input(wrapper_options = nil)
  ActiveSupport::SafeBuffer.new.tap do |o|
    collection = options[:classes].keys.collect { |c| [c.model_name.human, c] }
    label_method = :to_s
    value_method = :to_s
    o << @builder.select("#{attribute_name}_type", collection, { include_blank: true }, { class: 'form-control select required polymorphic-association-class-select' })
    options[:classes].each do |klass, url|
      o << "<a class=\"polymorphic-association-autocomplete-link\" data-class=\"#{klass}\" href=\"#{url}\" ></a>".html_safe
    end
    o << @builder.select("#{attribute_name}_id", [], {}, { class: 'form-control select required polymorphic-association-resource-select' })
  end
end