Migrations: Add migration for mrna_resources table

* migrations/auth/20221110_02_z1dWf-create-mrna-resources-table.py: new
  migration
* tests/unit/auth/test_create_table_migrations.py: test for new migration

2 files changed, 24 insertions, 1 deletions

diff --git a/migrations/auth/20221110_02_z1dWf-create-mrna-resources-table.py b/migrations/auth/20221110_02_z1dWf-create-mrna-resources-table.py
new file mode 100644
index 0000000..0959116
--- /dev/null
+++ b/migrations/auth/20221110_02_z1dWf-create-mrna-resources-table.py
@@ -0,0 +1,22 @@
+"""
+Create 'mrna_resources' table
+
+NOTE: One "mRNA dataset" should only ever be linked to one and only one resource object.
+      One "resource object" should only ever be linked to one and only one "mRNA dataset".
+"""
+
+from yoyo import step
+
+__depends__ = {'20221110_01_WtZ1I-create-resources-table'}
+
+steps = [
+    step(
+        """
+        CREATE TABLE IF NOT EXISTS mrna_resources(
+            resource_id TEXT PRIMARY KEY,
+            dataset_id TEXT NOT NULL UNIQUE,
+            FOREIGN KEY(resource_id) REFERENCES resources(resource_id)
+        ) WITHOUT ROWID
+        """,
+        "DROP TABLE IF EXISTS mrna_resources")
+]
diff --git a/tests/unit/auth/test_create_table_migrations.py b/tests/unit/auth/test_create_table_migrations.py
index 024f04b..c8184e5 100644
--- a/tests/unit/auth/test_create_table_migrations.py
+++ b/tests/unit/auth/test_create_table_migrations.py
@@ -15,7 +15,8 @@ migrations_and_tables = (
     ("20221108_01_CoxYh-create-the-groups-table.py", "groups"),
     ("20221108_02_wxTr9-create-privileges-table.py", "privileges"),
     ("20221108_03_Pbhb1-create-resource-categories-table.py", "resource_categories"),
-    ("20221110_01_WtZ1I-create-resources-table.py", "resources"))
+    ("20221110_01_WtZ1I-create-resources-table.py", "resources"),
+    ("20221110_02_z1dWf-create-mrna-resources-table.py", "mrna_resources"))
 
 @pytest.mark.unit_test
 @pytest.mark.parametrize("migration_file,the_table", migrations_and_tables)