Migration to backfill LMSCourses from grouping

lms/migrations/versions/f61cb94edfc8_backfill_lms_course.py

@@ -0,0 +1,56 @@
+"""LMSCourse backfill."""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "f61cb94edfc8"
+down_revision = "2f05ff66ec2e"
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    conn.execute(
+        sa.text(
+            """
+        WITH backfill as (
+            -- Deduplicate "grouping" courses on authority_provided_id
+            SELECT DISTINCT ON (authority_provided_id)
+                "grouping".created,
+                "grouping".updated,
+                tool_consumer_instance_guid,
+                authority_provided_id,
+                lms_name,
+                lms_id
+            FROM "grouping"
+            -- join on application_instances to get the GUID
+            JOIN application_instances on application_instances.id = "grouping".application_instance_id
+            -- Pick only courses, not sections or groups
+            WHERE grouping.type ='course'
+            -- Pick the most recent "grouping" there are duplicates
+            ORDER BY authority_provided_id, "grouping".updated desc
+        )
+        INSERT INTO lms_course (
+             created,
+             updated,
+             tool_consumer_instance_guid,
+             h_authority_provided_id,
+             lti_context_id,
+             name
+        )
+        SELECT
+           created,
+           updated,
+           tool_consumer_instance_guid,
+           authority_provided_id,
+           lms_id,
+           lms_name
+        FROM backfill
+        -- We are already inserting rows in lms_course in the python code, leave those alone
+        ON CONFLICT (h_authority_provided_id) DO NOTHING
+    """
+        )
+    )
+
+
+def downgrade() -> None:
+    pass