Rails%203%20In%20Action

74 CHAPTER 3 Developing a real Rails application
method_missing. These are then used to construct a real method call and make Ruby
act as though the method exists. When you use the bang (find_by_name! with an
exclamation mark as opposed to find_by_name) version of this method, Active
Record raises an ActiveRecord::RecordNotFound exception if the record isn’t found.
This can prove helpful if, for example, you misspell a project’s name when trying to
use this step. The exception raised if you don’t capitalize the M in TextMate (thereby
making it Textmate) is this:
Then I should be on the project page for "Textmate 2"
Couldn't find Project with name = Textmate 2 (ActiveRecord::RecordNotFound)
If you don’t use the bang version of this method, the finder returns nil. If
project_path is passed nil, you get a hard-to-debug error:
Then I should be on the project page for "Textmate 2"
No route matches {:action => "show", :controller => "projects"}
This error claims that no route matches up to the ProjectsController’s show action,
but there actually is one: /projects/:id. The difference is that this route requires
you to pass through the id parameter too; otherwise the error occurs.
To debug something like this, you check and double check what values were being
passed where, particularly what $1 was coming back as, and whether Project.find_by_name
was returning any record. If you checked those two things, you’d
find that Project.find_by_name isn’t returning what you think it should be returning,
and hopefully you’d realize you were passing in the wrong name.
Upon running rake cucumber:ok, you now see that a step passes, but the rest of
the feature fails:
And I should be on the project page for "TextMate 2"
And I should see "TextMate 2 - Projects - Ticketee"
expected #has_content?("TextMate 2 - Projects - Ticketee")
to return true, got false
Why are you getting an error seemingly from RSpec? Because Capybara uses its helpers
internally to determine if it can find content. This error therefore means that Capybara
can’t find the content it’s looking for. What content? Have a look at the last line
of the backtrace:
features/creating_projects.feature:13:
Line 13 of features/creating_projects.feature is the And I should see "TextMate 2 -
Projects - Ticketee" step, which checks for content shown on the page. To make
this step pass, you need to define the content it should see. Write the code from the
following listing into app/views/projects/show.html.erb.
Listing 3.22 app/views/projects/show.html.erb