Rails automatically calls the `id` method inside scopes and the variable
name makes more sense if it represents investments instead of the number
of investments.
Why:
Heading filter where not being correctly displayed
How:
Increasing scenario to cover all possible combinations, and fixing the
heading_filters method of the Valuation Budget Investment Controller to
correctly:
* Find how many investments the valuator can access
* Count investments for each heading
Valuators should not be able to edit a finished valuation (only admins
should).
The valuation form is only shown to the valuator if he has that ability
(we've previously modified app/models/abilities/valuator.rb to be able
to rely on `valuate` over an investment to check that)
If the valuator can't see the form, we present him just the data in
plain text.
How:
Using a local variable at partials to set a hidden true/false value for
`valuation` parameter on the comment creation form.
Allowing that new param at the comment controller and using it when
building a new Comment.
Why:
Budget Investment's valuators should be able to see internal valuation
comments thread at both show and edit views.
How:
At Valuation::BudgetInvestmentsController:
* Include CommentableActions to gain access to the entire feature, with
required resource_model & resource_name methods.
* Add the only possible order (oldest to newest)
* Load comments on both show & edit actions, passing `valuations` flag
to the CommentTree in order to only list those.
At CommentTree:
* Use `valuations` flag as instance variable to decide wich
comment threat to load: valuations (if relation exists) or comments.
Before we could have multiple current budgets, as we now only have one
current_budget, some specs broke.
As there is no need to display multiple budgets to Valuators, only the
current budget is necessary, we can remove arrays and assume that only
a single budget, the current budget, is displayed to Valuators
