Banners created through the admin form were getting the default color.
However, banners created by other means (like the `db:dev_seed` rake
task) were not getting these default values.
This feature was originally implemented when we were using Rails 4.
With Rails 5, we can provide default values to all new banners and
simplify the code at the same time thanks to its `attribute` method.
Now, when creating a new banner, instead of getting a blank space, we
get an empty line with the banner's default background color, which most
users won't know what it's about until they fill in the banner's title.
So we're not displaying the content of the banner when it's empty,
thanks to the `:empty` CSS pseudoclass.
Using `sanitize` we make sure the `href` attribute does not execute any
dangerous code. The possibility of a banner pointing to a dangerous URL
was very reduced, though, since only administrators can edit this
attribute.
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
Banners were not been shown in certain pages; now
they are.
Spec to check if the banner is been shown correctly
added. Before it was in admins specs, now it has it's
own spec out of admins folder.
Keep a blank line before and after private
Keep a blank line before and after protected
Remove extra empty line at class body end
Remove extra blank line
Add final newline
Use 2 (not 3) spaces for indentation
Use 2 (not 4) spaces for indentation
Remove space before comma
Add space after comma
Remove trailing whitespaces
Remove unnecessary spacing
Use snake_case for variable names
Do not use then for multi-line if
Remove unused block argument - i
Use the new Ruby 1.9 hash syntax
Remove unused assignment to variable
Indent when as deep as case
Align attributes
Align end with def
