Ruby on Rails - Activerecord, select specific data

Question

This is my shema :

class Media< ApplicationRecord
  has_many :pictures
  has_many :videos
end
class Picture < ApplicationRecord
  belongs_to :media
end
class Video < ApplicationRecord
  belongs_to :media
end

Is it possible to get all medias that correspond to the model picture?

Andrey Deineko · Accepted Answer · 2017-04-14 06:38:47Z

2

Look into joins - it will return you all medias which have at least single picture associated:

Media.joins(:pictures)

If you mean to get the specific picture's media, then you just use the method provided by association:

Picture.first.media

answered Apr 14, 2017 at 6:38

Andrey Deineko

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2 Comments

marmeladze Over a year ago

will it work, or will it raise an error/warning or sth like that?

Andrey Deineko Over a year ago

@marmeladze I am not sure. The only possible issue here, is that Rails' Inflector might get lost. But that's easy fixed :)

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