Post recommendations backend

[smddzcy]

About

• Related Issues: #176

Implemented a basic post recommendation backend that looks at the data templates in common with other posts.

Changes

• Implement a post recommendation system.
• Return a random sample of recommendations (for both group and post recommendations) in case the recommendation count exceeds the given limit.
• Some linting fixes.

Visuals

It's not a visual change, but here are some examples from the returned data:

GET: http://127.0.0.1:8000/api/v1/recommend_posts/ Response:

{"results": [{"owner": 2, "data": [{"question": "Multiselect", "response": "Birds"}, {"question": "Area", "response": "text"}], "id": 2}, {"owner": 2, "data": [{"question": "Text", "response": "text 3"}], "id": 3}]}

GET: http://127.0.0.1:8000/api/v1/recommend_posts/?limit=1 Response:

{"results": [{"owner": 2, "data": [{"question": "Multiselect", "response": "Birds"}, {"question": "Area", "response": "text"}], "id": 2}]}

Testing

• Create some test users with groups and posts.
• Share some posts from all users, using some common templates.
• Login to a user and go to http://127.0.0.1:8000/api/v1/recommend_posts/ in your browser. (or send a GET request with authentication credentials from some REST client)
• You should see some posts that have been shared using the templates you are using the most.

[smddzcy]

@triforce930 This branch is magically merged... Let me know if you want me to change anything 😄