Issue 6225: Allow multiple periods in Assignments API routes

[sophia-huynh]

Proposed Changes

Updated the POST /api/courses/:course_id/assignments and PUT /api/courses/:course_id/assignments/:id API routes to accept the parameters submission_rule_type and submission_rule_periods, the latter allowing for one or more submission rule periods.

While there was formerly an implementation that would allow for a single submission rule to be included with a single period, this did not work and was undocumented. When the related parameters were provided, no errors were raised, but no updates were made. The related parameters have been removed and replaced with submission_rule_periods, as they weren't documented or functional in the first place.

Closes #6225

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Type of Change

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Type	Applies?
🚨 Breaking change (fix or feature that would cause existing functionality to change)
✨ New feature (non-breaking change that adds functionality)	X
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Questions and Comments

Formerly, there were checks for submission_rule.valid? which never succeeded due to the relationships/dependencies between submission rules, periods, and assignments. Thus, the rules were never updated (and the code within the conditional also wouldn't work correctly), and then a success was returned afterwards.

[coveralls]

Coverage Report for CI Build 31405301677

Coverage increased (+0.04%) to 90.664%

Details

• Coverage increased (+0.04%) from the base build.
• Patch coverage: 2 uncovered changes across 1 file (89 of 91 lines covered, 97.8%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
app/controllers/api/assignments_controller.rb	27	25	92.59%
Total (2 files)	91	89	97.8%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	51815
Covered Lines:	47997
Line Coverage:	92.63%
Relevant Branches:	2491
Covered Branches:	1239
Branch Coverage:	49.74%
Branches in Coverage %:	Yes
Coverage Strength:	129.58 hits per line

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💛 - Coveralls