Use explicit through table for media/decision many-to-many field

[AetherUnbound]

Fixes

Fixes #4286 by @AetherUnbound

Description

This PR changes the many-to-many relationship between media records and media decisions to reference media by the identifier rather than the Django default ID. This required creating a separate, explicit model and using the through property of ManyToManyField.

Warning
The migration for this would be quite complex if we wanted to preserve data because Django doesn't support altering through on M2M fields after creation. Fortunately, we don't have any data in these tables currently in production and no way to add it yet unless it's done explicitly through each model. Thus, I feel it's safe to take the migration approach set out here.

This produces the following SQL for migrations:

BEGIN;
--
-- Create model ImageDecisionThrough
--
CREATE TABLE "api_imagedecisionthrough" ("id" integer NOT NULL PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY, "decision_id" integer NOT NULL, "identifier" uuid NOT NULL);
--
-- Create model AudioDecisionThrough
--
CREATE TABLE "api_audiodecisionthrough" ("id" integer NOT NULL PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY, "decision_id" integer NOT NULL, "identifier" uuid NOT NULL);
--
-- Remove field media_objs from audiodecision
--
DROP TABLE "api_audiodecision_media_objs" CASCADE;
--
-- Add field media_objs to audiodecision
--
-- (no-op)
--
-- Remove field media_objs from imagedecision
--
DROP TABLE "api_imagedecision_media_objs" CASCADE;
--
-- Add field media_objs to imagedecision
--
-- (no-op)
ALTER TABLE "api_imagedecisionthrough" ADD CONSTRAINT "api_imagedecisionthr_decision_id_f589ea97_fk_api_image" FOREIGN KEY ("decision_id") REFERENCES "api_imagedecision" ("id") DEFERRABLE INITIALLY DEFERRED;
ALTER TABLE "api_imagedecisionthrough" ADD CONSTRAINT "api_imagedecisionthr_identifier_8f4f8995_fk_image_ide" FOREIGN KEY ("identifier") REFERENCES "image" ("identifier") DEFERRABLE INITIALLY DEFERRED;
CREATE INDEX "api_imagedecisionthrough_decision_id_f589ea97" ON "api_imagedecisionthrough" ("decision_id");
CREATE INDEX "api_imagedecisionthrough_identifier_8f4f8995" ON "api_imagedecisionthrough" ("identifier");
ALTER TABLE "api_audiodecisionthrough" ADD CONSTRAINT "api_audiodecisionthr_decision_id_cc8242d3_fk_api_audio" FOREIGN KEY ("decision_id") REFERENCES "api_audiodecision" ("id") DEFERRABLE INITIALLY DEFERRED;
ALTER TABLE "api_audiodecisionthrough" ADD CONSTRAINT "api_audiodecisionthr_identifier_16367ed5_fk_audio_ide" FOREIGN KEY ("identifier") REFERENCES "audio" ("identifier") DEFERRABLE INITIALLY DEFERRED;
CREATE INDEX "api_audiodecisionthrough_decision_id_cc8242d3" ON "api_audiodecisionthrough" ("decision_id");
CREATE INDEX "api_audiodecisionthrough_identifier_16367ed5" ON "api_audiodecisionthrough" ("identifier");
COMMIT;

Testing Instructions

Run just down -v && just api/init. Then open a connection to the database with just api/dbshell and run:

COPY public.api_imagedecision (id, created_on, updated_on, notes, action, moderator_id) FROM stdin;
1	2024-05-01 23:27:09.884471+00	2024-05-01 23:27:09.884487+00		rejected_reports	3
2	2024-05-01 23:32:51.386486+00	2024-05-01 23:32:51.386501+00		marked_sensitive	3
\.


COPY public.api_imagedecisionthrough (id, decision_id, identifier) FROM stdin;
1	1	2e22c7e7-58b7-486c-9df8-16e84c27478f
2	2	052d2cfc-fdcb-40de-994c-40eadef753fc
\.


COPY public.nsfw_reports (id, identifier, reason, description, status, created_at, decision_id) FROM stdin;
1	2e22c7e7-58b7-486c-9df8-16e84c27478f	mature		pending_review	2024-04-26 20:44:31.271278+00	\N
2	2e22c7e7-58b7-486c-9df8-16e84c27478f	dmca		pending_review	2024-04-26 20:44:36.178746+00	\N
4	2e22c7e7-58b7-486c-9df8-16e84c27478f	mature		pending_review	2024-04-26 20:44:46.869982+00	\N
5	c296b69b-c8d7-4fc3-b820-a83de6138e0e	dmca		pending_review	2024-04-26 20:44:52.034395+00	\N
6	de37812d-2daa-49f6-91ab-e87e780ca653	dmca	asdfsadfsadfsadfsadfsadf	pending_review	2024-04-26 20:45:31.272964+00	\N
7	de37812d-2daa-49f6-91ab-e87e780ca653	dmca		pending_review	2024-05-01 21:12:53.177529+00	\N
8	c296b69b-c8d7-4fc3-b820-a83de6138e0e	dmca		pending_review	2024-05-01 21:21:10.442789+00	\N
9	ba711b67-2cbe-487a-9feb-19d70accf912	dmca		pending_review	2024-05-01 21:28:45.869087+00	\N
3	2e22c7e7-58b7-486c-9df8-16e84c27478f	other		pending_review	2024-04-26 20:44:42.274724+00	1
10	052d2cfc-fdcb-40de-994c-40eadef753fc	dmca		pending_review	2024-05-01 21:31:04.020163+00	2
\.

This is similar to the testing described in #4254, but note the difference in the intermediary table. Visit http://localhost:50280/admin/api/image/ locally to see the reports & decisions.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (just catalog/generate-docs for catalog
  PRs) or the media properties generator (just catalog/generate-docs media-props
  for the catalog or just api/generate-docs for the API) where applicable.

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/4310

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Changed files 🔄:

• https://docs.openverse.org/_preview/4310/meta/media_properties/api.html

[dhruvkb]

LGTM! I'm not opposed to having it but the base model is kind of redundant here because all of its fields have to be overridden in the subclasses.

[AetherUnbound]

LGTM! I'm not opposed to having it but the base model is kind of redundant here because all of its fields have to be overridden in the subclasses.

I wasn't sure how best to handle that case, since we have some other abstract models in a similar vein! Happy to remove it though 😄

Edit: Since it's referenced by another abstract model, I'd rather keep it currently.

[openverse-bot]

Based on the high urgency of this PR, the following reviewers are being gently reminded to review this PR:

@obulat
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[obulat]

I tested this locally, and it all worked well.

I'm not sure that this is a problem with this PR, or should be fixed separately, but the way the decision is displayed in the Image Report view does not provide any information:

I think it should show what the decision actually was?

[AetherUnbound]

I'm not sure that this is a problem with this PR, or should be fixed separately, but the way the decision is displayed in the Image Report view does not provide any information.
I think it should show what the decision actually was?

This is just the Django Admin default, and it's temporary as well while we build out the rest of the features!

openverse/api/api/admin/__init__.py

Lines 57 to 59 in 0a7d31b

	# Temporary addition of model admin for decisions while this view gets built
	admin.site.register(ImageDecision, admin.ModelAdmin)
	admin.site.register(AudioDecision, admin.ModelAdmin)

[github-actions]

This PR has migrations. Please rebase it before merging to ensure that conflicting migrations are not introduced.