Test error message when validating model with rspec - ruby-on-rails

Question

I've inherited a rails api and I'm trying to test controllers. I have an endpoint '/api/v1/vitcords' where I create new vitcords. The video model only has a validation name. So my doubt is how to test that when I create a new video without specify a name, I get the message error I want, that in this case is "Vitcord name has to be specified". Thanks.
This is the Vcord model
class Vcord
include Mongoid::Document
include Mongoid::Timestamps
include Mongoid::Spacial::Document
include Concerns::Vitcord::M3u8
include Concerns::Vitcord::User
# Validations
validates_presence_of :name
# Atributes
field :name, type: String
field :location, type: Array, spacial: true
field :address, type: String
field :closed, type: Boolean, default: false
field :public, type: Boolean, default: false
field :thumb, type: String
end
This is the controller video_controller.rb
module Api::V1
class VitcordsController < ApiController
def create
user = current_resource_owner
# Validation
param! :name, String, required: true
param! :location, Hash, required: false
param! :address, String, required: false
ap params[:location]
ap params[:location][:latitude]
ap params[:location][:longitude]
# Creating
vcord = Vcord.new()
vcord.name = params[:name] if params[:name]
if params[:location] && params[:location]['latitude'] && params[:location]['longitude']
vcord.location = {
lng: params[:location]['longitude'],
lat: params[:location]['latitude']
}
end
vcord.address = params[:address] if params[:address]
vcord.creator = user
if vcord.save
vcord.members.each do |member|
Notification.generate_notification_for_vitcord_invited(vcord, member)
end
#vitcord = vcord
else
error(:internal_server_error, ["Vitcord name has to be specified"], nil)
end
end
end
And this is the spec
require 'rails_helper'
describe "POST /api/v1/vitcords" do
before(:each) do
db_drop
post "/oauth/token", {
:grant_type => 'assertion',
:assertion => TOKEN
}
#token = response_json['access_token']
end
it "sends an error if a vitcord is created with name nil" do
header 'Authorization', "Bearer #{#token}"
post '/api/v1/vitcords', {
address: "Calle Rue del Percebe",
location: {
latitude: 40.7127837,
longitude: -74.00594130000002
}
}
//This does not work but it would be something like this
expect(error).to eq("Name has to be specified")
end
end

Answer 1

Well, you should refactor your code, but answering your question, you can add an error to you object by doing (look that I used #vcord and not vcord):
#vcord.errors.add(:name, 'Vitcord name has to be specified')
(as you can see here http://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-add)
and on your test:
expect(assigns(:vcord).errors.name).to eq('Vitcord name has to be specified').