Document Support for has_and_belongs_to_many (HABTM) tables

[prem-prakash]

Is it possible to add support to has_and_belongs_to_many tables that has no model ?

[pjambet]

Hi,

This is currently not supported (I guess the README could be more explicit about this), as we use model classes to generate the seed file.

I think this would be a great feature, but sadly I can't guarantee that I'll have time to work on this anytime soon.

As usual, I'd be very happy to take a look at a PR of you want to implement this feature :)

[tbloncar]

Dug into this a bit this evening, and it appears that the has_and_belongs_to_many join table does actually get a pair of implicit backing models. Given the following:

class Product
  has_and_belongs_to_many :categories
end

class Category
  has_and_belongs_to_many :products
end

We get two backing HABTM models: Product::HABTM_Categories and Category::HABTM_Products. As far as I can tell (having implemented a test for this on my fork), registering either of these models should do the trick.

SeedMigration.register Category::HABTM_Products

I'd be happy to submit a PR with the test and some documentation for this.

[pboling]

@tbloncar still interested in submitting a PR for this?