Yared Yemane
8dd1d40a16
Reject creating a second practice on the same course, module, or lesson with 409 Conflict, and enforce the rule in the database via unique partial indexes. Co-authored-by: Cursor <cursoragent@cursor.com>
32 lines
928 B
SQL
32 lines
928 B
SQL
-- Learn English: at most one lms_practice per course, module, or lesson parent.
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-- Remove duplicate rows (keep the earliest practice per parent) before adding constraints.
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DELETE FROM lms_practices a
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USING lms_practices b
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WHERE a.course_id IS NOT NULL
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AND a.course_id = b.course_id
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AND a.id > b.id;
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DELETE FROM lms_practices a
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USING lms_practices b
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WHERE a.module_id IS NOT NULL
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AND a.module_id = b.module_id
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AND a.id > b.id;
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DELETE FROM lms_practices a
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USING lms_practices b
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WHERE a.lesson_id IS NOT NULL
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AND a.lesson_id = b.lesson_id
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AND a.id > b.id;
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CREATE UNIQUE INDEX idx_lms_practices_one_per_course
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ON lms_practices (course_id)
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WHERE course_id IS NOT NULL;
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CREATE UNIQUE INDEX idx_lms_practices_one_per_module
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ON lms_practices (module_id)
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WHERE module_id IS NOT NULL;
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CREATE UNIQUE INDEX idx_lms_practices_one_per_lesson
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ON lms_practices (lesson_id)
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WHERE lesson_id IS NOT NULL;
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