form_for with :slug instead of :id

Question

<%= form_for [current_user, @task] do |f| %>

gives users/:id/tasks but I would need users/:slug/tasks as I am using:

resources :users, param: :slug do
  resources :tasks, only: [:index, :new, :create]
end

but if I use:

<%= form_for [current_user.slug, @task] do |f| %>

I get: NoMethodError: undefined method 'jemelle_visits_path' for

how to get users/jemelle/tasks instead?

arieljuod · Accepted Answer · 2020-10-09 23:09:43Z

2

I think you need to override the to_param method of your model:

https://apidock.com/rails/ActiveRecord/Base/to_param

user = User.find_by_name('Phusion')
user_path(user)  # => "/users/1"
You can override to_param in your model to make user_path construct a path using the user’s name instead of the user’s id:
class User < ActiveRecord::Base
  def to_param  # overridden
    name
  end
end

user = User.find_by_name('Phusion')
user_path(user)  # => "/users/Phusion"

answered Oct 9, 2020 at 23:09

arieljuod

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3 Comments

user3755529 Over a year ago

this surprisingly work.. I told you didn't understand the question at first. Is that #to_param overwriting the method that form_for uses to translate the argument into a path?

user3755529 Over a year ago

yes it does just that, and I could change User#name to my User#slug

arieljuod Over a year ago

form_for uses the type of the object to infer it has to call user_path, and then user_path calls .to_param on that object (to_param defaults to the id)

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