Dynamically direct routes for polymorphic associations - Ruby on Rails
source link: https://dev.to/wizardhealth/dynamically-direct-routes-for-polymorphic-associations-5hhb
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Dynamically direct routes for polymorphic associations - Ruby on Rails
Have you ever struggled with polymorphic associations? We all have, don’t worry.
Here’s an example of a polymorphic relationship.
class Picture < ApplicationRecord belongs_to :imageable, polymorphic: true end
class Employee < ApplicationRecord has_many :pictures, as: :imageable end
class Product < ApplicationRecord has_many :pictures, as: :imageable end
I’ve recently bumped into a problem where I had to list out all subjects (employees and products in this case) and when user interacted with one list item, it would redirect to that subject’s show page.
<table> <thead> <tr> <th>Name</th> </tr> </thead> <tbody> <% @imageable.each do |imageable| %> <tr> <td> <%= link_to imageable.name, ?????? %> </td> </tr> <% end %> </tbody> </table>
You can see the problem, right? The obvious solution here would be to check the type of imageable and set the path helper accordingly. But, there’s a slightly more advanced technique for this use-case: direct method.
In your routes.rb file simply add this:
direct(:imageable) { |imageable| route_for ("#{imageable.class.name.underscore}".to_sym, imageable) }
And now you can use imageable_path(imageable) as a path helper that will dynamically resolve to imageable’s show page.
Now our example above becomes:
<table> <thead> <tr> <th>Name</th> </tr> </thead> <tbody> <% @imageable.each do |imageable| %> <tr> <td> <%= link_to imageable.name, imageable_path(imageable) %> </td> </tr> <% end %> </tbody> </table>
Aaaand voilà, we’ve got a path helper that resolves to any imageable show page without the need to manually check for the type of imageable.
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