use postgresql for development
create Comment
implement relation between comment and staff/need
change url to comment
change layout in needs/show
change database for test
debug tests
delete .all because Relation#all is deprecated.
add setting because of I18n.enforce_available_locales
implement comments#create
implement comments#update
delete scaffolds.css.scss
change table layout needs#index
hide edit and delete buttons when staff_id is not mine.
add comments to send mail