Attach discussions to other objects about govready-q

[davidpofo]

Because the Discussion Model has a GenericForeignKey( attached_to = GenericForeignKey('attached_to_content_type', 'attached_to_object_id')) it can be attached to any model with a GenericRelation like so:

class Comment(models.Model):
    ...
    likes = GenericRelation(Discussion)

# Creating a new like in the discussion
discussion.likes.create(attached_to_content_type=Discussion.LIKE, user=request.user)

In this example there is a constant in Discussion called LIKE. This issue then seems to either be enhancing the Discussion methods are present and applying GenericRelations to at least the User and Comment models. This is all to say the Discussion model is all setup to attach to other models.

[davidpofo]

Unless otherwise discussed below the methods are already ready to be added given the Generic Relationship Discussion can have with any other model (given its GenericForeignKey)

• is_discussion_deleted() is now .is_discussion_inactive() (note there is no deleting of a discussion yet implemented.)
• get_project_context_dict doesn't seem relevant for any other model besides task.
• is_public() doesn't seems to do anything as assigning the attribute is_discussion_public to a model doesn't happen anywhere so it always returns the default which is False.
• Added get_discussion_autocompletes changes to get the organization from the discussion(should be 1 to 1). If another models wants to implement it they can look at the get_discussion_autocompletes in TaskAnswer
• on_discussion_comment assumes a task to get the org which is easy enough to replace (comment.discussion.organization) however it also needs a project for the task which you cannot get from the comment.
• on_discussion_comment_edited is not implemented see TODO line 95 in discussion/views.py
• get_user_role is implemented solely assuming a task in TaskAnswer