CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4activerecord
rubhan
rubhan

Reputation: 34

Active record, undefined method

I am getting undefined method error in my rails console if I try to get something from model SubQuantity
I have a model called Subquantity, right now in my model I have
SubQuantity.rb
belongs_to :product
belongs_to :cart
end
and I have an integer defined in SubQuantity model called sub_quantity. In my code I am trying to do something like this
subq = SubQuantity.where(product_id:@product.id, cart_id:current_user.cart.id)
in return I am getting this,
[#<SubQuantity:0x007fbbdc046d08
id: 4,
sub_quantity: 1,
product_id: 4,
cart_id: 6,
created_at: Sun, 22 May 2016 11:03:55 UTC +00:00,
updated_at: Sun, 22 May 2016 11:03:55 UTC +00:00>]
and whenever I try to do something like this,
subq.sub_quantity
I am getting this error,
NoMethodError: undefined method sub_quantity for
#<SubQuantity::ActiveRecord_Relation:0x007fbbdc04d838>.
This is not only with sub_quantity, I am getting exact errors for every thing in subq even with subq.id. What is wrong here ?

Upvotes: 0

Views: 1099

Answers (1)

Volodymyr Balytskyy
Volodymyr Balytskyy

Reputation: 577

Whenever you use where method, it returns an array even if the result is one object. To fix your problem you must call .first, to extract the first result from the array (in this case is the only one). Example:

subq = SubQuantity.where(product_id: @product.id, cart_id: current_user.cart.id)
subq.first.sub_quantity

Another way, without first would be to use find_by. It works just like wheremethod but returns exactly one result, the first one it can find.

subq = SubQuantity.find_by(product_id: @product.id, cart_id: current_user.cart.id)
subq.sub_quantity

Upvotes: 1

Related Questions