Add migration to change environment_roles role column from string to

enum type.
Fix tests and functions affected by the column type change.

alembic/versions/828d8c188dce_update_environment_roles_enum_list.py

@@ -0,0 +1,58 @@
+"""update environment_roles enum list
+
+Revision ID: 828d8c188dce
+Revises: 5d7198d34b91
+Create Date: 2020-01-08 16:08:03.879881
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '828d8c188dce' # pragma: allowlist secret
+down_revision = '5d7198d34b91' # pragma: allowlist secret
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    conn = op.get_bind()
+    conn.execute(
+        """
+        UPDATE environment_roles
+        SET role = NULL
+        """
+    )
+
+    op.alter_column(
+        "environment_roles",
+        "role",
+        type_=sa.Enum(
+            "ADMIN",
+            "BILLING_READ",
+            "CONTRIBUTOR",
+            name="role",
+            native_enum=False,
+        ),
+        existing_type=sa.VARCHAR(),
+        nullable=True,
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "environment_roles",
+        "status",
+        type_=sa.VARCHAR(),
+        existing_type=sa.Enum(
+            "ADMIN",
+            "BILLING_READ",
+            "CONTRIBUTOR",
+            name="status",
+            native_enum=False,
+        ),
+    )
+    # ### end Alembic commands ###