<form action="/users" class="new_user" id="new_user" method="post"> in Java

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<form action="/users" class="new_user" id="new_user" method="post">
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As noted in Section 812, this HTML issues a POST request to the /users URL In an analogy with the get method, which issues a GET request inside of tests, we use the post
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Signup Failure
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A mockup of the signup failure page
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method to issue a POST request to the create action As we ll see shortly, create takes in a hash corresponding to the object type being created; since this is a test for signup failure, we ll just pass an @attr hash with blank entries, as seen in Listing 86 This is essentially equivalent to visiting the signup page and clicking on the button without filling in any of the fields
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Listing 86 Tests for failed user signup
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spec/controllers/users_controller_specrb
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require 'spec_helper' describe UsersController do
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render_views describe "POST 'create'" do describe "failure" do before(:each) do @attr = { :name => "", :email => "", :password => "", :password_confirmation => "" } end it "should not create a user" do lambda do post :create, :user => @attr endshould_not change(User, :count) end
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8: Sign Up
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it "should have the right title" do post :create, :user => @attr responseshould have_selector("title", :content => "Sign up") end it "should render the 'new' page" do post :create, :user => @attr responseshould render_template('new') end end end end
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The final two tests are relatively straightforward: we make sure that the title is correct, and then we check that a failed signup attempt just re-renders the new user page (using the render_template RSpec method) The first test, on the other hand, is a little tricky The purpose of the test
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it "should not create a user" do lambda do post :create, :user => @attr endshould_not change(User, :count) end
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Signup Failure
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is to verify that a failed create action doesn t create a user in the database To do this, it introduces two new elements First, we use the RSpec change method to return the number of users in the database:
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change(User, :count)
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This defers to the Active Record count method, which simply returns how many records of that type are in the database For example, if you cleared the development database at the beginning of the chapter, this count should currently be 0:
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$ rails console >> Usercount => 0
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The second new idea is to wrap the post :create step in a package using a Ruby construct called a lambda,2 which allows us to check that it doesn t change the User count:
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lambda do post :create, :user => @attr endshould_not change(User, :count)
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Although this lambda may seem strange at this point, there will be more examples in the tests to come, and the pattern will quickly become clear
822 A Working Form
We can get the tests from Section 821 to pass with the code in Listing 87 This listing includes a second use of the render method, which we first saw in the context of partials (Section 513); as you can see, render works in controller actions as well Note that we ve taken this opportunity to introduce an if-else branching structure, which allows us to handle the cases of failure and success separately based on the value of @usersave
2 The name comes from the lambda calculus, a mathematical system for representing functions and their operations
Listing 87 A create action that can handle signup failure (but not success)
8: Sign Up
app/controllers/users_controllerrb
class UsersController < ApplicationController def create @user = Usernew(params[:user]) if @usersave # Handle a successful save else @title = "Sign up" render 'new' end end end
The best way to understand how the code in Listing 87 works is to submit the form with some invalid signup data; the results appear in Figure 86 To get a clearer picture of how Rails handles the submission, let s take a closer look at the params hash in the debug information at the bottom of Figure 86:
--- !map:ActiveSupport::HashWithIndifferentAccess commit: Sign up authenticity_token: rB82sI7Qw5J9J1UMILG/VQL411vH5puR+Jw1xL5cMQ= action: create controller: users user: !map:ActiveSupport::HashWithIndifferentAccess name: Foo Bar password_confirmation: dude password: dude email: foo@invalid
We saw starting in Section 632 that the params hash contains information about each request; in the case of a URL like /users/1, the value of params[:id] is the id of the corresponding user (1 in this example) In the case of posting to the signup form, params instead contains a hash of hashes, a construction we first saw in Section 433, which introduced the strategically named params variable in a console session This debug information above shows that submitting the form results in a user hash with attributes corresponding to the submitted values, where the keys