In case we receive consecutive requests we are locking the poll author record
until the first request transaction ends, so the author answers count during
subsequent requests validations is up to date.
Up until now, we were assuming the voter was valid, but were not raising
an exception if it wasn't. And in the user interface everything seemed
to be working properly.
We were having this issue when skipping verification, when there could
be voters without a document number, which would be considered invalid.
Raising an exception when failing to save the voter and making sure the
answer and the voter are saved inside a transaction solves the problem.
Not doing so has a few gotchas when working with relations, particularly
with records which are not stored in the database.
I'm excluding the related content file because it's got a very peculiar
relationship with itself: the `has_one :opposite_related_content` has no
inverse; the relation itself is its inverse. It's a false positive since
the inverse condition is true:
```
content.opposite_related_content.opposite_related_content.object_id ==
content.object_id
```
Usually when we specify a `belongs_to` relations, we also specify its
equivalent `has_many`. That allows us to write, for example:
`topic.user.topics`.
We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
