Presenters: Typical Example

This page will show you an example of what a typical rails app using presenter looks like.

contacts_controller.rb

class ContactsController < ApplicationController
  respond_to :json, :html, :js

  def index
    @contacts = Contact.all
    respond_with @contacts
  end

  def new
    @contact = Contact.new
    respond_with @contact
  end

  def create 
    @contact = Contact.new(contact_params)
    if @contact.save
      respond_with @contact
    else
      xms_error @contact
    end
  end

  def edit
    @contact = Contact.where(id: params[:id]).first
    respond_with @contact
  end

  def update
    @contact = Contact.where(id: params[:id]).first
    if @contact.update_attributes(contact_params)
      respond_with @contact
    else
      xms_error @contact
    end
  end

private
  def contact_params
    params.require(:contact).permit(:name, :email)
  end
end

contacts_presenter.coffee

class Application.Presenters.ContactPresenter extends Transponder.Presenter
  presenterName: 'contacts'
  module: 'application'

  index: ->
    $(@element).html(@response)

  edit: ->
    $(@element).html(@response)
    $(@element).modal()

  new: ->
    @edit()

  create: ->
    $(@element).append(@response)
    $("#modal-box").modal('toggle')

  update: ->
    $(@element).replaceWith(@response)
    $('#modal-box').modal('toggle')

  error: 
    update: (errors, element) ->
      for key, value of errors
        $("input#contact_#{key}").tooltip
          title: value[0]
        $("input#contact_#{key}").tooltip('show')

    create: (errors, element) ->
      @update(errors, element)

You can see that code reuseability is great with Transponder's Presenters