Allow users request access to private categories: rendering custom template on exception

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AI 生成的摘要

The discussion revolves around a plugin to allow users to request access to private categories on Discourse. rilla is working on this plugin and has already made progress, including adding a setting to show read-restricted categories in the category list and throwing a custom NoAccessToCategory exception when a user tries to access a restricted category.

rilla has also created a custom template to display a message when a user with no access clicks on a restricted category. However, this custom template is not rendering correctly when the category is accessed through the Ember frontend.

rilla is seeking help from the community, specifically with implementing the custom template rendering in Ember, as they come from a Rails background and are unfamiliar with Ember. jord8on has asked if rilla was able to get this working.

1

Hi all,

I’m working on this plugin which adds a setting to allow showing read-restricted categories in the category list.

This is already working (you can check the code in the Github repo), but now, as a next step, I want to show a custom view when a user with no access clicks on a restricted category.

My intention is to add a message to that view explaining that the category is private and encourage the user to register and request access to the category.

The way I’m doing this is adding a new NoAccessToCategory exception that is thrown whenever a user tries to access the restricted category, and now I’m trying to rescue from this category and show a custom template.

This is what I’ve done so far:

  1. Declare the new exception:
 # lib/discourse.rb
class NoAccessToCategory < StandardError; end
  1. Tweak CategoryGuardian so it throws NoAccessToCategory instead of NotFound:
# lib/guardian/category_guardian.rb
def ensure_can_see!(obj)
   raise Discourse::NoAccessToCategory.new("Can't see #{obj}") unless can_see?(obj)
end
  1. Rescue in ApplicationController:
  # app/controllers/application_controller.rb
  rescue_from Discourse::NoAccessToCategory do
    if (request.format && request.format.json?) || (request.xhr?)
      # No idea what to do here
    else
      render_to_string status: 200, layout: 'no_ember', formats: [:html], template: '/exceptions/no_access_to_category'
    end
end
  1. Build the view:
  # app/views/exceptions/no_access_to_category.html.erb
  <h1>No access to this category</h1>
  <div>
     You don't have access to this category
  </div>

This is working when I browse directly to a restricted category url (i.e. no AJAX request), but it’s not working when the category is accessed by clicking through the Ember frontend.

I’m completely unfamiliar with Ember (I come from a Rails background), and I would be very grateful if someone could give me some pointers as to how should I implement this.

Once it’s done, I will of course release this and hopefully will be of some use for other users – I’ve seen this requested in a couple of threads: here and here.

2

Hello @rilla! Were you able to get this working?