Rails API ActionController::RoutingError: No route matches [POST] "/goals" - ruby-on-rails

Question

I'm creating a simple API with Rails and my test for creating a Goal resource is failing due to a RoutingError -- but I'm not sure why.
I can see when I do rake routes that the POST /goals route exists.
In my my routes.rb, I've set up namespace :api to be path: '/', so I think my post request should be working.
Can anyone help me point out what I've done wrong?
Here's my routes.rb
Rails.application.routes.draw do
with_options except: [:new, :edit] do |list_only|
namespace :api, path: '/', constraints: { subdomain: 'api' } do
list_only.resources :goal
end
end
end
Here are my routes:
$ rake routes
Prefix Verb URI Pattern Controller#Action
api_goals GET /goals(.:format) api/goals#index {:subdomain=>"api"}
POST /goals(.:format) api/goals#create {:subdomain=>"api"}
api_goal GET /goals/:id(.:format) api/goals#show {:subdomain=>"api"}
PATCH /goals/:id(.:format) api/goals#update {:subdomain=>"api"}
PUT /goals/:id(.:format) api/goals#update {:subdomain=>"api"}
DELETE /goals/:id(.:format) api/goals#destroy {:subdomain=>"api"}
My goals_controller.rb
class API::GoalsController < ApplicationController
before_action :set_goal, only: [:show, :edit, :update, :destroy]
def index
goals = Goal.all
if is_complete = params[:is_complete]
goals = goals.where(is_complete: is_complete)
end
render json: goals, status: 200
end
def show
goal = Goal.find(params[:id])
render json: goal, status: 200
end
def create
goal = Goal.new(goal_params)
if goal.save
# render nothing: true, status: 204, location: goal
head 204, location: goal
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_goal
#goal = Goal.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def goal_params
params.require(:goal).permit(:description, :motivation, :completion_date, :is_complete)
end
end
Here's the test:
require 'test_helper'
class CreatingGoalsTest < ActionDispatch::IntegrationTest
test 'creates goals' do
post '/goals',
{
description: "string",
motivation: "another string",
completion_date: "01/01/2014",
is_complete: true
}.to_json,
{ 'Accept' => Mime::JSON, 'Content-Type' => Mime::JSON.to_s }
assert_equal 201, response.status
assert_equal Mime::JSON, response.content_type
goal = json(response.body)
assert_equal goal_url(goal[:id]), response.location
end
end
Here's the error:
$ rake test:integration
Run options: --seed 27226
# Running:
E....
Finished in 0.102621s, 48.7230 runs/s, 116.9351 assertions/s.
1) Error:
CreatingGoalsTest#test_creates_goals:
ActionController::RoutingError: No route matches [POST] "/goals"
test/integration/creating_goals_test.rb:5:in `block in <class:CreatingGoalsTest>'
Thank you!

Answer 1

This can happen when the subdomain is not set in the test as rails is expecting it, you can override the host that is provided by adding the following:
def setup
host! 'api.example.com'
end
to your test suite.
class CreatingGoalsTest < ActionDispatch::IntegrationTest
def setup
host! 'api.example.com'
end
test 'creates goals' do
post '/goals',
{
description: "string",
motivation: "another string",
completion_date: "01/01/2014",
is_complete: true
}.to_json,
{ 'Accept' => Mime::JSON, 'Content-Type' => Mime::JSON.to_s }
assert_equal 201, response.status
assert_equal Mime::JSON, response.content_type
goal = json(response.body)
assert_equal goal_url(goal[:id]), response.location
end
end
Further resources on subdomains and testing in rails: Testing in Rails with Subdomains