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Ruby Build a Todo List Application with Rails 4 Build a Todo List Application with Rails 4 Write Our First Tests

Andreaus Perkins
Andreaus Perkins
14,402 Points
Posted by Andreaus Perkins
Andreaus Perkins
14,402 Points

Can someone explain the difference between TodoList and todo_list, when you're trying to verify the existence of titles?

Can someone explain why we're using TodoList and not todo_list (or todo_lists)?

it "displays an error when the todo list has no title" do
        expect(TodoList.count).to eq(0)

Any help is appreciated.

6 Answers

Roberto Alicata
PLUS
Roberto Alicata
Courses Plus Student 39,959 Points
Roberto Alicata
Roberto Alicata
Courses Plus Student 39,959 Points

TodoList is the the name of the Model ( that inherits from ActiveRecord::Base ).

Roberto Alicata
PLUS
Roberto Alicata
Courses Plus Student 39,959 Points
Roberto Alicata
Roberto Alicata
Courses Plus Student 39,959 Points

The Test starts expecting there are no Todo List checking TodoList.count.

Then it continue trying to add a new Todo list but without a title, so we want it returns an error and the TodoList.count still be 0. In fact, if the todolist does not have a title no records are saved in the database.

Andreaus Perkins
Andreaus Perkins
14,402 Points
Andreaus Perkins
Andreaus Perkins
14,402 Points

So why are we using "TodoList" instead of "todo_list"? I'm still confused. The app is named "odot", so I'm not sure where TodoList came from.

Andreaus Perkins
Andreaus Perkins
14,402 Points
Andreaus Perkins
Andreaus Perkins
14,402 Points

So "TodoList.count" is checking the entire class for an entry?

Roberto Alicata
PLUS
Roberto Alicata
Courses Plus Student 39,959 Points
Roberto Alicata
Roberto Alicata
Courses Plus Student 39,959 Points

Yes it checks the TodoList table on the database. The TodoList is the class name for your model that was created when you wrote the command "rails generate scaffold todo_list ...." in the app/models/todo_list.rb

Ben Goldman
Ben Goldman
14,626 Points
Ben Goldman
Ben Goldman
14,626 Points

Thanks from me, too! Great answer.