CODEWITHSUNDEEP
ruby-on-rails
AbUndZu
AbUndZu

Reputation: 153

How to add relation to existing object in Rails

I want to add relation between existing post and author.

I was trying to modify created_by attribute but it's not accessible from object.

def set_author
    if (@post.created_by.empty? && @post.author_code.present?)
      if @post.author_code == params[:author_code]
        @post.created_by = current_user
      else
        raise(ExceptionHandler::InvalidAuthorCode, Message.invalid_author_code)
      end
    else
      raise(ExceptionHandler::DisallowedAction, Message.action_not_allowed)
  end
end

It's not working because there is no method @post.created_by even if it's present db. Post model from schema.rb

create_table "posts", force: :cascade do |t|
  t.string "title"  
  t.text "content"
  t.boolean "accepted", default: false
  t.string "created_by"
  t.datetime "created_at", null: false
  t.datetime "updated_at", null: false
  t.string "author_code"
end

Edit: part of post.rb

  belongs_to :user, optional: true, foreign_key: :created_by

part of user.rb

  has_many :confessions, foreign_key: :created_by

Upvotes: 0

Views: 58

Answers (2)

AbUndZu
AbUndZu

Reputation: 153

I was trying to update @post attributes a wrong way. Changed 

@post.created_by = current_user

to

@post.update_attribute(:created_by, current_user)

and it's working. It's not a Devise user model, just self written.

Upvotes: 0

Abdul Baig
Abdul Baig

Reputation: 3721

Assuming that it only fails for the @post which don't have any created_by OR user then you can use following:

@post.try(:created_by).blank? && @post.author_code.present?

Upvotes: 1

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