Rails - Seeding HABTM associations

Question

Equipment.create(name: "Room to run")
Equipment.create(name: "Pull-up bar")
Workout.create(
  description: "Do 100 pull-ups then run 5km",
  :equipment => Equipment.where(:name => 'Pull-up bar'))

Equipment and Workouts have a HABTM relationship. The above seeds code works but how can I also assign a second equipment association at the same time as the first?

score 7 · Accepted Answer · answered Jul 07 '12 at 19:25

7

In the where condition, you can use array:

Equipment.create(name: "Room to run")
Equipment.create(name: "Pull-up bar")
Workout.create(
  description: "Do 100 pull-ups then run 5km",
  :equipment => Equipment.where(:name => ['Pull-up bar', 'Room to run']))

answered Jul 07 '12 at 19:25

Matzi

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The use of equipment in this example is unfortunate. The noun equipment is both singular and plural, which hides an important detail. If we were talking about dogs the example would look like: :dogs => Dog.where(:name => ['Fido', 'Butch'])) – J Edward Ellis Nov 03 '16 at 22:47

score 3 · Answer 2 · answered Dec 14 '15 at 18:18

In the seeds file this simple list worked with products and categories(HABTM) relationship. It's super literal and effective.

Product.find(1).categories << Category.find(4)
Product.find(1).categories << Category.find(5)
Product.find(2).categories << Category.find(5)

Rails - Seeding HABTM associations

2 Answers2