Adding relationships to datafile model to permit to attach files to post.
We need to add some migration, and models...
The datafiles is not a tableless model anymore.
update the init.sql
debug.
set the filename and the file save path not as the same way.
remove post_attached_file_id to data_files table...
remove erd.pdf.
add some views...
file manager controller cleanup.
model attach file to post method...
attachTo model method return a boolean.
use the attachTo model method to a controller attachment method.
add annotate gem for devs.
add a file manager list view.
add a view to attachment process.
run annotate on models.
run annotate on Tests.
routing.
serve static assets/stuffes...
update the filemanager list view...
... and the filemanagerview.