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swt2-intro-exercise / rails-exercise-20-felixauringer

rails-exercise-20-felixauringer created by GitHub Classroom
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Paper should have and belong to many authors #13

Closed swt2public closed 3 years ago

swt2public commented 3 years ago

Scenario

Given a paper Then it should have an empty list of authors

Hints

A paper can have many authors and an author can write many papers. This relationship is indicated in Rails by annotating both models (i.e. the Author and Paper) with a has_and_belongs_to_many association.

To store this n:m relation, create a new database table in a migration: guide. There is a generator which can produce join tables if 'JoinTable' is part of the name:

rails generate migration CreateJoinTableAuthorPaper author paper

To test if such a relation exists, you can test whether a paper has an empty list of authors.

Reminder: Migrations are stored in db/migrate and are applied with the rails db:migrate command.

Error

Got NoMethodError: undefined method `authors' for #

38/44 exercise tests have passed

felixauringer commented 3 years ago

Fixed in 19df66f3b6b0a80e49e1b855a3ef6ca2f6adc350