I'm having a problem testing the following model:
class Bill < ActiveRecord::Base
belongs_to :consignee
before_save :calc_rate
def calc_rate
self.chargeableweight = self.consignee.destination.rate * self.weight
end
end
The consignee model:
class Consignee < ActiveRecord::Base
belongs_to :destination
has_many :bills
end
The controllers are not touched yet.
The behavior of the app is correct (follow up question: are there any performance problems with that solution?) - but the the test break.
You have a nil object when you didn't
expect it! You might have expected an
instance of Array. The error occurred
while evaluating nil.*
Thank you in advice,
Danny
update:
This bill test breaks using factory girl:
describe Bill do
it "should call the calc_rate method" do
bill = Factory.build(:bill)
bill.save!
bill.should_receive(:calc_rate)
end
end
You have a nil object when you didn't expect it!
Factories:
Factory.define :destination do |f|
f.airport_code "JFK"
end
Factory.define :consignee do |f|
...
f.association :destination
end
Factory.define :bill do |f|
f.association :consignee
f.weight 10
f.chargeableweight 20.0
f.after_create do |bill|
bill.calc_rate
end
describe Consignee do
it "should calculate the rate" do
#pending
#make sure this spec is passing first, so you know your calc_rate method is fine.
end
it "should accept calc_rate before save" do
cosignee = mock("Consignee")
consignee.should_receive(:calc_rate).and_return(2) # => stubbing your value
end
end
I didn't spool up a rails app to test this code, but this should get you close. also, assuming that the columns chargeable_rate, weight, etc are columns on the model, you dont need to call self. Ruby will implicitly expect self if there is no instance method or variable of that name available it will automatically look for class methods.
Related
Here is the base question for the test:
We've changed the code below so we're mocking ZombieMailer.tweet method instead of the entire method. There is still more to do to make this example work. First, finish the let(:mail) statement below by creating a stub with a deliver method that returns true.
Then update the mock so the call to the tweet method returns the mail stub you created.
Unfortunately I can not alter the models, question, or mailer.
Models:
# tweet.rb
class Tweet < ActiveRecord::Base
belongs_to :zombie
validates :message, presence: true
attr_accessible :message
after_create :email_tweeter
def email_tweeter
ZombieMailer.tweet(zombie, self).deliver
end
private :email_tweeter
end
# zombie.rb
class Zombie < ActiveRecord::Base
has_many :tweets
validates :email, presence: true
attr_accessible :email
end
Mailer:
class ZombieMailer < ActionMailer::Base
def tweet(zombie, tweet)
mail(:from => 'admin#codeschool.com',
:to => zombie.email,
:subject => tweet.message)
end
end
I keep bouncing around on this and could use a few pointers. Here is what I have been working with now that I got past test question 3. Now they are asking to add the deliver method, but his method does not exist, or at least I am not placing it in the correct place.
UPDATED
describe Tweet do
context 'after create' do
let(:zombie) { Zombie.create(email: 'anything#example.org') }
let(:tweet) { zombie.tweets.new(message: 'Arrrrgggghhhh') }
let(:mail) { stub(:deliver => true) }
it 'calls "tweet" on the ZombieMailer' do
ZombieMailer.should_receive(:tweet).returns(:mail)
tweet.save
end
end
end
And the error message is:
Failures:
1) Tweet after create calls "tweet" on the ZombieMailer
Failure/Error: ZombieMailer.should_receive(:tweet).returns(:mail)
NoMethodError:
undefined method `returns' for #<RSpec::Mocks::MessageExpectation:0x0000000519ab90>
# zombie_spec.rb:8:in `block (3 levels) '
Finished in 0.37725 seconds
1 example, 1 failure
Failed examples:
rspec zombie_spec.rb:7 # Tweet after create calls "tweet" on the ZombieMailer
Any rspec peeps out there can point me in the right direction as to what I am missing here? Thank you.
Thank you to #Paritosh and #Alex from the comments above, here is the final answer.
describe Tweet do
context 'after create' do
let(:zombie) { Zombie.create(email: 'anything#example.org') }
let(:tweet) { zombie.tweets.new(message: 'Arrrrgggghhhh') }
let(:mail) { stub(:deliver => true) }
it 'calls "tweet" on the ZombieMailer' do
ZombieMailer.should_receive(:tweet).and_return(mail)
tweet.save
end
end
end
Here is the base question for the test:
Update the spec so that whenever a tweet is created, we verify that email_tweeter is called on the tweet object. ***I can not alter the models, question, or mailer.***
Models:
# tweet.rb
class Tweet < ActiveRecord::Base
belongs_to :zombie
validates :message, presence: true
attr_accessible :message
after_create :email_tweeter
def email_tweeter
ZombieMailer.tweet(zombie, self).deliver
end
private :email_tweeter
end
# zombie.rb
class Zombie < ActiveRecord::Base
has_many :tweets
validates :email, presence: true
attr_accessible :email
end
Mailer:
class ZombieMailer < ActionMailer::Base
def tweet(zombie, tweet)
mail(:from => 'admin#codeschool.com',
:to => zombie.email,
:subject => tweet.message)
end
end
I keep bouncing around on this and could use a few pointers. Here is what I have been working with now: UPDATED
describe Tweet do
context 'after create' do
let(:zombie) { Zombie.create(email: 'anything#example.org') }
let(:tweet) { zombie.tweets.new(message: 'Arrrrgggghhhh') }
it 'calls "email_tweeter" on the tweet' do
tweet.email_tweeter.should_receive(:zombie)
tweet.save
end
end
end
And the error message is:
Failures:
1) Tweet after create calls "email_tweeter" on the tweet
Failure/Error: tweet.email_tweeter.should_receive(:zombie)
NoMethodError:
private method `email_tweeter' called for #<Tweet:0x000000062efb48>
# zombie_spec.rb:7:in `block (3 levels) '
Finished in 0.26328 seconds
1 example, 1 failure
Failed examples:
rspec zombie_spec.rb:6 # Tweet after create calls "email_tweeter" on the tweet
Any rspec peeps out there can point me in the right direction as to what I am missing here? Thank you.
How about this:
it 'calls "email_tweeter" on the tweet' do
tweet.should_receive(:email_tweeter)
tweet.save
end
do this
it 'calls "email_tweeter" on the tweet' do
tweet.email_tweeter.should_receive(:zombie)
tweet.save
end
Remove:
private :email_tweeter
You can't test private methods.
Update:
In fact you can test private methods (with send or eval methods which do not care about privacy), but you shouldn't, as those are part of implementation not the final output. In your tests you should rather save a new tweet an check that email has been sent. implementation details can change with time, it shouldn't affect tests as long as the mail is being send. You can for example try:
it 'generates and sends an email' do
tweet.save
ActionMailer::Base.deliveries.last.message.should eq tweet.message
end
I have an (I think) relatively straightforward has_many :through relationship with a join table:
class User < ActiveRecord::Base
has_many :user_following_thing_relationships
has_many :things, :through => :user_following_thing_relationships
end
class Thing < ActiveRecord::Base
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
end
class UserFollowingThingRelationship < ActiveRecord::Base
belongs_to :thing
belongs_to :user
end
And these rspec tests (I know these are not necessarily good tests, these are just to illustrate what's happening):
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
#thing = Thing.create!(:name => "Foo")
#user.things << #thing
end
it "should have created a relationship" do
UserFollowingThingRelationship.first.user.should == #user
UserFollowingThingRelationship.first.thing.should == #thing
end
it "should have followers" do
#thing.followers.should == [#user]
end
end
This works fine UNTIL I add an after_save to the Thing model that references its followers. That is, if I do
class Thing < ActiveRecord::Base
after_save :do_stuff
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def do_stuff
followers.each { |f| puts "I'm followed by #{f.name}" }
end
end
Then the second test fails - i.e., the relationship is still added to the join table, but #thing.followers returns an empty array. Furthermore, that part of the callback never gets called (as if followers is empty within the model). If I add a puts "HI" in the callback before the followers.each line, the "HI" shows up on stdout, so I know the callback is being called. If I comment out the followers.each line, then the tests pass again.
If I do this all through the console, it works fine. I.e., I can do
>> t = Thing.create!(:name => "Foo")
>> t.followers # []
>> u = User.create!(:name => "Bar")
>> u.things << t
>> t.followers # [u]
>> t.save # just to be super duper sure that the callback is triggered
>> t.followers # still [u]
Why is this failing in rspec? Am I doing something horribly wrong?
Update
Everything works if I manually define Thing#followers as
def followers
user_following_thing_relationships.all.map{ |r| r.user }
end
This leads me to believe that perhaps I am defining my has_many :through with :source incorrectly?
Update
I've created a minimal example project and put it on github: https://github.com/dantswain/RspecHasMany
Another Update
Thanks a ton to #PeterNixey and #kikuchiyo for their suggestions below. The final answer turned out to be a combination of both answers and I wish I could split credit between them. I've updated the github project with what I think is the cleanest solution and pushed the changes: https://github.com/dantswain/RspecHasMany
I would still love it if someone could give me a really solid explanation of what is going on here. The most troubling bit for me is why, in the initial problem statement, everything (except the operation of the callback itself) would work if I commented out the reference to followers.
I've had similar problems in the past that have been resolved by reloading the association (rather than the parent object).
Does it work if you reload thing.followers in the RSpec?
it "should have followers" do
#thing.followers.reload
#thing.followers.should == [#user]
end
EDIT
If (as you mention) you're having problems with the callbacks not getting fired then you could do this reloading in the object itself:
class Thing < ActiveRecord::Base
after_save { followers.reload}
after_save :do_stuff
...
end
or
class Thing < ActiveRecord::Base
...
def do_stuff
followers.reload
...
end
end
I don't know why RSpec has issues with not reloading associations but I've hit the same types of problems myself
Edit 2
Although #dantswain confirmed that the followers.reload helped alleviate some of the problems it still didn't fix all of them.
To do that, the solution needed a fix from #kikuchiyo which required calling save after doing the callbacks in Thing:
describe Thing do
before :each do
...
#user.things << #thing
#thing.run_callbacks(:save)
end
...
end
Final suggestion
I believe this is happening because of the use of << on a has_many_through operation. I don't see that the << should in fact trigger your after_save event at all:
Your current code is this:
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
#thing = Thing.create!(:name => "Foo")
#user.things << #thing
end
end
class Thing < ActiveRecord::Base
after_save :do_stuff
...
def do_stuff
followers.each { |f| puts "I'm followed by #{f.name}" }
end
end
and the problem is that the do_stuff is not getting called. I think this is the correct behaviour though.
Let's go through the RSpec:
describe Thing do
before(:each) do
#user = User.create!(:name => "Fred")
# user is created and saved
#thing = Thing.create!(:name => "Foo")
# thing is created and saved
#user.things << #thing
# user_thing_relationship is created and saved
# no call is made to #user.save since nothing is updated on the user
end
end
The problem is that the third step does not actually require the thing object to be resaved - its simply creating an entry in the join table.
If you'd like to make sure that the #user does call save you could probably get the effect you want like this:
describe Thing do
before(:each) do
#thing = Thing.create!(:name => "Foo")
# thing is created and saved
#user = User.create!(:name => "Fred")
# user is created BUT NOT SAVED
#user.things << #thing
# user_thing_relationship is created and saved
# #user.save is also called as part of the addition
end
end
You may also find that the after_save callback is in fact on the wrong object and that you'd prefer to have it on the relationship object instead. Finally, if the callback really does belong on the user and you do need it to fire after creating the relationship you could use touch to update the user when a new relationship is created.
UPDATED ANSWER **
This passes rspec, without stubbing, running callbacks for save (after_save callback included ), and checks that #thing.followers is not empty before trying to access its elements. (;
describe Thing do
before :each do
#user = User.create(:name => "Fred");
#thing = Thing.new(:name => 'Foo')
#user.things << #thing
#thing.run_callbacks(:save)
end
it "should have created a relationship" do
#thing.followers.should == [#user]
puts #thing.followers.inspect
end
end
class Thing < ActiveRecord::Base
after_save :some_function
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def some_function
the_followers = followers
unless the_followers.empty?
puts "accessing followers here: the_followers = #{the_followers.inspect}..."
end
end
end
ORIGINAL ANSWER **
I was able to get things to work with the after_save callback, so long as I did not reference followers within the body / block of do_stuff. Do you have to reference followers in the real method you are calling from after_save ?
Updated code to stub out callback. Now model can remain as you need it, we show #thing.followers is indeed set as we expected, and we can investigate the functionality of do_stuff / some_function via after_save in a different spec.
I pushed a copy of the code here: https://github.com/kikuchiyo/RspecHasMany
And spec passing thing* code is below:
# thing_spec.rb
require 'spec_helper'
describe Thing do
before :each do
Thing.any_instance.stub(:some_function) { puts 'stubbed out...' }
Thing.any_instance.should_receive(:some_function).once
#thing = Thing.create(:name => "Foo");
#user = User.create(:name => "Fred");
#user.things << #thing
end
it "should have created a relationship" do
#thing.followers.should == [#user]
puts #thing.followers.inspect
end
end
# thing.rb
class Thing < ActiveRecord::Base
after_save :some_function
has_many :user_following_thing_relationships
has_many :followers, :through => :user_following_thing_relationships, :source => :user
def some_function
# well, lets me do this, but I cannot use #x without breaking the spec...
#x = followers
puts 'testing puts hear shows up in standard output'
x ||= 1
puts "testing variable setting and getting here: #{x} == 1\n\t also shows up in standard output"
begin
# If no stubbing, this causes rspec to fail...
puts "accessing followers here: #x = #{#x.inspect}..."
rescue
puts "and this is but this is never seen."
end
end
end
My guess is that you need to reload your Thing instance by doing #thing.reload (I'm sure there's a way to avoid this, but that might get your test passing at first and then you can figure out where you've gone wrong).
Few questions:
I don't see you calling #thing.save in your spec. Are you doing that, just like in your console example?
Why are you calling t.save and not u.save in your console test, considering you're pushing t onto u? Saving u should trigger a save to t, getting the end result you want, and I think it would "make more sense" considering you are really working on u, not t.
I have 2 models, one which accepts attributes for the other and I'm trying to find a clever way to use Factory girl to setup the data for both.
Class Booking
has_many :booking_items
accepts_nested_attributes_for :booking_items
Class BookingItem
belong_to :booking
my factory
Factory.define :booking do |f|
f.bookdate Date.today+15.days
f.association :space
f.nights 2
f.currency "EUR"
f.booking_item_attributes Factory.build(:booking_item) # doesn't work
end
Factory.define :booking_item do |f|
f.association :room
f.bookdate Date.today
f.people 2
f.total_price 20
f.association :booking
end
booking_spec
require "spec_helper"
describe Booking do
before(:each) do
#booking = Factory.create(:booking)
end
it "should be valid" do
#needs children to be valid
#booking.should be_valid
end
end
I looked around the rdocs but couldn't seem to find what I was looking for.
If I understood you correctly, you want to do this, but with terser syntax:
booking_item = Factory(:booking_item, :people => 4)
booking = Factory(:booking, :booking_item => booking_item)
Of cause you can shortcut it like this:
def with_assocs factory, assocs_hashes = {}, attrs = {}
assoc_models = Hash[ assocs_hash.map { |k, v| [k, Factory(k, v)] } ]
Factory factory, attrs.merge(assoc_models)
end
And use like this:
#booking = with_assocs :booking, :booking_item => {:people => 3}
#booking.should be_valid
In active_factory plugin with similar factory definitions it would look like this:
models { booking - booking_item(:people => 3) }
booking.should be_valid
Unfortunately I haven't yet implemented integration with factory_girl. Though if you interested any input is very welcome.
Trying to get this function test to pass:
test "should create question" do
assert_difference('Question.count') do
post :create, :question => #question.attributes
end
end
But #question has validators that require specific children to be present specifically one topic:
class Question < ActiveRecord::Base
has_many :topic_questions
has_many :topics, :through => :topic_questions
validate :has_topic
def has_topic
(errors[:base] << "You must have one topic") if (topics.count < 1)
end
end
How would I 1) build the topic for #question in the test and then 2) pass it to the post method since it wouldnt be passed by the .attributes() function?
test "should create question" do
assert_difference('Question.count') do
#question.topics<<Topic.new(**set topics required and attribute here )
#or try this line of code
#question[:topics]={:name=>"bla bla" ** set attribute here what u need}
post :create, :question => #question.attributes
end
end
The test is fine, it's the controller and/or model that needs changing. You haven't shown the contents of the create action, but there are basically two ways to do it:
#question = Question.new(params[:question])
#question.build_topic(<some_params>)
if #question.save
# ... etc ...
Or, use accepts_nested_attributes_for :topic in the Question model and then pass the topic parameters in the params hash. Which method is best depends on your specific circumstances.