Home>
card = Card.where (user_id: current_user.id) .first
redirect_to action: "show" if card.exists?
Use this with find_by
card = Card.find_by (user_id: current_user.id)
redirect_to action: "show" if card.exists?
, but NoMethodError at/card/new undefined method `exists? 'for nil: NilClass
What can I do to solve it?
-
Answer # 1
Related questions
- [ruby on rails] i want to display a parent model that matches the information of the associated child model
- ruby - payjp payment information screen is not displayed properly [rails]
- html - css reflected only on iphone (i want to unify)
- html - i want to assign a variable to the url
- ruby - image is not reflected on heroku
- javascript - i want to apply a method only to a specific element for the element acquired by queryselecterall
- ruby - i want to cancel nameerror in prototypes # index
- javascript - i want to display google map in the view
- ruby - when the search result of the model is displayed by the function to see more in kaminari, the whole is displayed instead
- ruby - rails5 array contains unintended backslashes
As the error message says, there is no
I thinknil.exists?method.find_byreturnsnilif it doesn't hit after searching.if card.blank?etc. should be used. (blank?can be eithernilor an empty relation.true)