In my rails app I have following models:
class Book < ApplicationRecord
belongs_to :bookable, polymorphic: true
end
class Student < ApplicationRecord
has_many :books, as: :bookable
end
class Library < ApplicationRecord
has_many :books, as: :bookable
end
When creating a new book object in form.html.erb, how I could map t.integer :bookable_id and t.string :bookable_type to specific object?
Ideally I would use grouped_collection_select and pull first Student and Library and below their ids.
Thanks in advance.
When creating a new book object in form.html.erb, how I could map t.integer :bookable_id and t.string :bookable_type to specific object?
Well, you can use the collection_select
or grouped_collection_select
(according to your requirements) to display Students
and Libraries
to store the values for bookable_id
.
For bookable_type
, Rails under the hood reads the class names of the instances and captures the class name and stores it as a value for bookable_type
. For example, consider the below approach
@student = Student.find(1)
@student.books.create
The above code snippet will create a record in books
table with bookable_id = 1
and bookable_type = "Student"
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