CODEWITHSUNDEEP
ruby-on-railsrelationshiphas-manyhas-oneruby-on-rails-4.2
Arnaud
Arnaud

Reputation: 17737

Rails 4.2: updating relationships, via a relationship…

I have a the following models:

class Part
  belongs_to :note, inverse_of: :part, dependent: :destroy

class Note
  has_many :attachments, as: :attachable, dependent: :destroy
  has_one :part, inverse_of: :note
end

class Attachment
  belongs_to :attachable, polymorphic: true, touch: true
end

When I add attachments to a note, I do it via the part

def update
  @part = current_user.parts.find params[:id]
  @part.note.update note_params
  …
end

What I find strange is the following:

def update
  @part = current_user.parts.find params[:id]
  @part.note.update note_params
  @part.note.attachments.any? # => false
  @part.note.attachments.any? # => true
end

Why does the first call return false? Since I need this in my view, I'm left with calling @part.note.reload, but I can't understand what is going on.

Thanks

Upvotes: 1

Views: 756

Answers (1)

janfoeh
janfoeh

Reputation: 10328

Associations are cached for performance reasons. Use association(true) to bypass the cache and force Rails to refetch the current state after you have done something to change it:

@part.note(true).attachments.any?

See Association Basic: Controlling Caching.

Upvotes: 4

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