The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.
Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.
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 debate by the current user:
```authorize! :create, Vote.new(voter: current_user, votable: @debate)```
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: :debate, through_association: :votes_for```
This line tries to load the resource @debate 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 @debate.vote_by (which
is called by @debate.register_vote).
We were using the same logic six times regarding when we should show a
"participation not allowed" message. Since we're going to change the
current behavior, we're unifying the logic in one place so the changes
will be easier.
We were using the same code to render links to agree and disagree, so we
can extract a new component for this code.
We're also adding component tests to make it easier to test whether
we're breaking anything while refactoring, although the code is probably
already covered by system tests.
Since the votes mixin was only used in one place, we're removing it and
moving most of its code to a new CSS file for the shared component.
This way we can make the view code a bit easier to read.
We're also changing the order of the conditions a little bit so we only
check for the presence of a current user once.
To make sure we aren't breaking anything with these changes, we're
adding some tests. We're also replacing one system test checking content
with a component test, since component tests are much faster.
Just like we did in commit 0214184b2d for investments, we're removing
some possible optimizations (we don't have any benchmarks proving they
affect performance at all) in order to simplify the code.
The investement votes component `delegate` code was accidentally left
but isn't used since commit 0214184b2, so we're removing it now that
we're removing the `voted_for?` helper method.
