Building A Rails App with Relationships

Introduction

Note: This can be a pair programming activity or done independently. Instructors may want to do a short introduction to strong params, the rails console, and migrations in Rails.

For this lab, we are going to build a Cookbook app with several models that interact one another.

Exercise

Requirements

• Create a rails app
• Create a model Recipe that has these attributes:
  • Name (string)
  • Instructions (text)
  • Servings (integer)
• Create a model Course with one attribute: name as a string
• Link Recipe and Course so that a course has many recipes and a recipe belongs to a course
• Test if associations works in the Rails console (rails c)

Bonus:

• Create a model Ingredient and a has_many and belongs_to relations between recipes and ingredients (Hints: You need a Join table)

OPTIONAL for tomorrow

• Be sure to create the RESTful controller actions and the corresponding routes
• then set up the appropriate views

Deliverable

You should be able to go to rails c and create new course, recipes (and ingredients for bonus) and be able to call these

• Course.first.recipes
• Recipe.first.course
• Recipe.first.ingredients (bonus)
• Ingredients.first.recipe (bonus)
• Ingredients.first.recipe.course (bonus)

Additional Resources

• ActiveRecord docs