Adds cascade to study relationship so data loader doesn't freak out.

crc/models/approval.py

@@ -18,7 +18,7 @@ class ApprovalModel(db.Model):
     __tablename__ = 'approval'
     id = db.Column(db.Integer, primary_key=True)
     study_id = db.Column(db.Integer, db.ForeignKey(StudyModel.id), nullable=False)
-    study = db.relationship(StudyModel, backref='approval')
+    study = db.relationship(StudyModel, backref='approval', cascade='all,delete')
     workflow_id = db.Column(db.Integer, db.ForeignKey(WorkflowModel.id), nullable=False)
     workflow_version = db.Column(db.String)
     approver_uid = db.Column(db.String)  # Not linked to user model, as they may not have logged in yet.

example_data.py

@@ -14,7 +14,8 @@ class ExampleDataLoader:
         session.flush()  # Clear out any transactions before deleting it all to avoid spurious errors.
         for table in reversed(db.metadata.sorted_tables):
             session.execute(table.delete())
-            session.flush()
+        session.commit()
+        session.flush()
 
     def load_all(self):
 

migrations/versions/55c6cd407d89_.py

@@ -0,0 +1,39 @@
+"""empty message
+
+Revision ID: 55c6cd407d89
+Revises: cc4bccc5e5a8
+Create Date: 2020-05-22 22:02:46.650170
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '55c6cd407d89'
+down_revision = 'cc4bccc5e5a8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('approval',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('study_id', sa.Integer(), nullable=False),
+    sa.Column('workflow_id', sa.Integer(), nullable=False),
+    sa.Column('workflow_version', sa.String(), nullable=True),
+    sa.Column('approver_uid', sa.String(), nullable=True),
+    sa.Column('status', sa.String(), nullable=True),
+    sa.Column('message', sa.String(), nullable=True),
+    sa.ForeignKeyConstraint(['study_id'], ['study.id'], ),
+    sa.ForeignKeyConstraint(['workflow_id'], ['workflow.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('approval')
+    # ### end Alembic commands ###