Cv2 4095 shared feed cluster data model api backend

[melsawy]

Description

Apply data model

• A Cluster belongs to a Feed (many-to-one)
• A Feed has many Cluster’s (one-to-many)
• A ProjectMedia has and belongs to many Cluster’s (many-to-many)

• Permissions: The feed permissions apply to its clusters
• set a first cluster item as center
• Change cluster cached field logic to match new changes
• Fix tests

References: CV2-4095

How has this been tested?

Depend on automated tests.

Things to pay attention to during code review

Please describe parts of the change that require extra attention during code review, for example:

• File FFFF, line LL: This refactoring does this and this. Is it consistent with how it’s implemented elsewhere?
• Etc.

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[codeclimate]

The PR diff size of 87916 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

The PR diff size of 87868 lines exceeds the maximum allowed for the inline comments feature.

[caiosba]

Thanks @melsawy - I won't review/merge, but just take the work from here.

[codeclimate]

Code Climate has analyzed commit 2d21f16 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 90.3% (100% is the threshold).

This pull request will bring the total coverage in the repository to 99.9% (0.0% change).

View more on Code Climate.

[caiosba]

@melsawy thanks, feel free to delete this PR/branch after you review #1802 - I incorporated these changes there.