Adaptive learning: Add weight to links between competencies and learning objects

[JohannesStoehr]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• I chose a title conforming to the naming conventions for pull requests.

Server

• Important: I implemented the changes with a very good performance and prevented too many (unnecessary) and too complex database calls.
• I strictly followed the principle of data economy for all database calls.
• I strictly followed the server coding and design guidelines.
• I added multiple integration tests (Spring) related to the features (with a high test coverage).
• I documented the Java code using JavaDoc style.

Client

• Important: I implemented the changes with a very good performance, prevented too many (unnecessary) REST calls and made sure the UI is responsive, even with large data (e.g. using paging).
• I strictly followed the principle of data economy for all client-server REST calls.
• I strictly followed the client coding and design guidelines.
• I added multiple integration tests (Jest) related to the features (with a high test coverage), while following the test guidelines.
• I documented the TypeScript code using JSDoc style.

Motivation and Context

#9446

Description

Add a column to the connection between exercises/lecture units (learning objects) and competencies that represents a weight or importance of this learning object for the content of the competency. To reflect this in Java the many-to-many relation is now two many to one relations with a new CompetencyExercise/LectureUnitLink between the learning object and the competency.
The weight is currently always set to 1, it will be adjustable in a follow up.

The table in the competency form is removed for now and will be redone by @ardakaraman0

Steps for Testing

Prerequisites:

• 1 Instructor
• 2 competencies/prerequisites

1. Log in to Artemis
2. Check that creating/editing/importing an exercise/lecture unit still works in the following situations:
   • Linking a competency
   • Unlinking a competency
   • Changing the linked competencies

Testserver States

Note

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Review Progress

Performance Review

• I (as a reviewer) confirm that the client changes (in particular related to REST calls and UI responsiveness) are implemented with a very good performance even for very large courses with more than 2000 students.
• I (as a reviewer) confirm that the server changes (in particular related to database calls) are implemented with a very good performance even for very large courses with more than 2000 students.

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Performance Tests

• Test 1
• Test 2

Test Coverage

Server

Class/File	Line Coverage	Confirmation (assert/expect)
CompetencyExerciseLink.java	93%	✅
CompetencyLearningObjectLink.java	100%	✅
CompetencyLectureUnitLink.java	93%	✅

[Malekos74]

Merge Conflict reapprove

[MaximilianAnzinger]

Maintainer approved

[JohannesWt]

Reapprove after merge conflict