Uniting document/case/service/topic/point comment tables under one "commentable" association

[madoleary]

We have five different tables in the database that seem to do the exact same thing. I think they need to be united under one table via a type of polymorphic association: https://guides.rubyonrails.org/association_basics.html#polymorphic-associations

It would work like this:

class Comment < ApplicationRecord
belongs_to :commentable, polymorphic: true
end

class Document < ApplicationRecord
has_many :comments, as: :commentable
end

class Case < ApplicationRecord
has_many :comments, as: :commentable
end

class Service < ApplicationRecord
has_many :comments, as: :commentable
end

class Topic < ApplicationRecord
has_many :comments, as: :commentable
end

class Point < ApplicationRecord
has_many :comments, as: :commentable
end

Each comment would be stored with a "type" property, which would indicate whether it was a comment for a point, case, service, document, topic, etc.

The hard part would be figuring out what to do with existing comments. On the plus side, we could knock five controllers down to a single controller, and do away with a number of views.