As far as possible I think the code is clearer if we use CRUD actions
rather than custom actions. This will make it easier to add the action
to remove votes in the next commit.
Note that we are adding this line as we need to validate it that a vote
can be created on a comment by the current user:
```authorize! :create, Vote.new(voter: current_user, votable: @comment)```
We have done it this way and not with the following code as you might
expect, as this way two votes are created instead of one.
```load_and_authorize_resource through: :comment, through_association: :votes_for```
This line tries to load the resource @comment and through the association
"votes_for" it tries to create a new vote associated to that debate.
Therefore a vote is created when trying to authorise the resource and
then another one in the create action, when calling @comment.vote.
Hovering over the votes showed a "participation not allowed" message
which was annoying when scrolling with the browser or simply moving the
mouse around the page. Furthermore, it hid the information about the
number of votes, links to show/collapse replies, ...
We're planning to change the behavior of all the "participation not
allowed" messages in order to show them on click instead of showing them
on hover (just like it's done on touchscreens). In the case of comments,
supports, however, there's very limited space in the part showing the
number of supports for comments, so adding this message without breaking
the layout is challenging.
So, for now, we're simply redirecting unauthenticated users to the login
page. If find an easy way to implement a better user interface in the
future to display the "participation not allowed" message, we might
change this behaviour.
