[fix] make names non-nullable

UPDATING.md

@@ -36,6 +36,10 @@ using `ENABLE_PROXY_FIX = True`, review the newly-introducted variable,
 backend serialization. To disable set `RESULTS_BACKEND_USE_MSGPACK = False`
 in your configuration.
 
+* [8371](https://github.com/apache/incubator-superset/pull/8371): makes
+`tables.table_name`, `dbs.database_name`, `datasources.cluster_name`, and `clusters.cluster_name` non-nullable.
+Depending on the integrity of the data, manual intervention may be required.
+
 ## 0.34.0
 
 * [7848](https://github.com/apache/incubator-superset/pull/7848): If you are

superset/connectors/druid/models.py

@@ -128,7 +128,7 @@ class DruidCluster(Model, AuditMixinNullable, ImportMixin):
     id = Column(Integer, primary_key=True)
     verbose_name = Column(String(250), unique=True)
     # short unique name, used in permissions
-    cluster_name = Column(String(250), unique=True)
+    cluster_name = Column(String(250), unique=True, nullable=False)
     broker_host = Column(String(255))
     broker_port = Column(Integer, default=8082)
     broker_endpoint = Column(String(255), default="druid/v2")
@@ -480,7 +480,9 @@ class DruidDatasource(Model, BaseDatasource):
     is_hidden = Column(Boolean, default=False)
     filter_select_enabled = Column(Boolean, default=True)  # override default
     fetch_values_from = Column(String(100))
-    cluster_name = Column(String(250), ForeignKey("clusters.cluster_name"))
+    cluster_name = Column(
+        String(250), ForeignKey("clusters.cluster_name"), nullable=False
+    )
     cluster = relationship(
         "DruidCluster", backref="datasources", foreign_keys=[cluster_name]
     )

superset/connectors/sqla/models.py

@@ -306,7 +306,7 @@ class SqlaTable(Model, BaseDatasource):
     __tablename__ = "tables"
     __table_args__ = (UniqueConstraint("database_id", "table_name"),)
 
-    table_name = Column(String(250))
+    table_name = Column(String(250), nullable=False)
     main_dttm_col = Column(String(250))
     database_id = Column(Integer, ForeignKey("dbs.id"), nullable=False)
     fetch_values_predicate = Column(String(1000))

superset/migrations/versions/b6fa807eac07_make_names_non_nullable.py

@@ -0,0 +1,120 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+"""make_names_non_nullable
+
+Revision ID: b6fa807eac07
+Revises: 258b5280a45e
+Create Date: 2019-10-02 00:29:16.679272
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+from superset.utils.core import generic_find_fk_constraint_name
+
+# revision identifiers, used by Alembic.
+revision = "b6fa807eac07"
+down_revision = "258b5280a45e"
+
+conv = {
+    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
+    "uq": "uq_%(table_name)s_%(column_0_name)s",
+}
+
+
+def upgrade():
+    bind = op.get_bind()
+    insp = sa.engine.reflection.Inspector.from_engine(bind)
+
+    # Deal with foreign key constraint
+    fk_datasources_cluster_name_clusters = (
+        generic_find_fk_constraint_name(
+            "datasources", {"cluster_name"}, "clusters", insp
+        )
+        or "fk_datasources_cluster_name_clusters"
+    )
+    with op.batch_alter_table("datasources", naming_convention=conv) as batch_op:
+        batch_op.drop_constraint(
+            fk_datasources_cluster_name_clusters, type_="foreignkey"
+        )
+        batch_op.alter_column(
+            "cluster_name", existing_type=sa.String(250), nullable=False
+        )
+
+    # Make fields non-nullable
+    with op.batch_alter_table("clusters") as batch_op:
+        batch_op.alter_column(
+            "cluster_name", existing_type=sa.String(250), nullable=False
+        )
+    with op.batch_alter_table("dbs") as batch_op:
+        batch_op.alter_column(
+            "database_name", existing_type=sa.String(250), nullable=False
+        )
+    with op.batch_alter_table("tables") as batch_op:
+        batch_op.alter_column(
+            "table_name", existing_type=sa.String(250), nullable=False
+        )
+
+    # Re-create foreign key constraint
+    with op.batch_alter_table("datasources") as batch_op:
+        batch_op.create_foreign_key(
+            fk_datasources_cluster_name_clusters,
+            "clusters",
+            ["cluster_name"],
+            ["cluster_name"],
+        )
+
+
+def downgrade():
+    bind = op.get_bind()
+    insp = sa.engine.reflection.Inspector.from_engine(bind)
+
+    # Deal with foreign key constraint
+    fk_datasources_cluster_name_clusters = (
+        generic_find_fk_constraint_name(
+            "datasources", {"cluster_name"}, "clusters", insp
+        )
+        or "fk_datasources_cluster_name_clusters"
+    )
+    with op.batch_alter_table("datasources", naming_convention=conv) as batch_op:
+        batch_op.drop_constraint(
+            fk_datasources_cluster_name_clusters, type_="foreignkey"
+        )
+        batch_op.alter_column(
+            "cluster_name", existing_type=sa.String(250), nullable=True
+        )
+
+    # Make fields nullable
+    with op.batch_alter_table("clusters") as batch_op:
+        batch_op.alter_column(
+            "cluster_name", existing_type=sa.String(250), nullable=True
+        )
+    with op.batch_alter_table("dbs") as batch_op:
+        batch_op.alter_column(
+            "database_name", existing_type=sa.String(250), nullable=True
+        )
+    with op.batch_alter_table("tables") as batch_op:
+        batch_op.alter_column("table_name", existing_type=sa.String(250), nullable=True)
+
+    # Re-create foreign key constraint
+    with op.batch_alter_table("datasources") as batch_op:
+        batch_op.create_foreign_key(
+            fk_datasources_cluster_name_clusters,
+            "clusters",
+            ["cluster_name"],
+            ["cluster_name"],
+        )

superset/models/core.py

@@ -723,7 +723,7 @@ class Database(Model, AuditMixinNullable, ImportMixin):
     id = Column(Integer, primary_key=True)
     verbose_name = Column(String(250), unique=True)
     # short unique name, used in permissions
-    database_name = Column(String(250), unique=True)
+    database_name = Column(String(250), unique=True, nullable=False)
     sqlalchemy_uri = Column(String(1024))
     password = Column(EncryptedType(String(1024), config.get("SECRET_KEY")))
     cache_timeout = Column(Integer)
@@ -763,7 +763,7 @@ class Database(Model, AuditMixinNullable, ImportMixin):
     export_children = ["tables"]
 
     def __repr__(self):
-        return self.verbose_name if self.verbose_name else self.database_name
+        return self.name
 
     @property
     def name(self):

tests/core_tests.py

@@ -684,7 +684,9 @@ def test_mssql_engine_spec_odbc(self):
     def test_comments_in_sqlatable_query(self):
         clean_query = "SELECT '/* val 1 */' as c1, '-- val 2' as c2 FROM tbl"
         commented_query = "/* comment 1 */" + clean_query + "-- comment 2"
-        table = SqlaTable(sql=commented_query)
+        table = SqlaTable(
+            table_name="test_comments_in_sqlatable_query_table", sql=commented_query
+        )
         rendered_query = str(table.get_from_clause())
         self.assertEqual(clean_query, rendered_query)
 

tests/db_engine_specs_test.py

@@ -158,7 +158,7 @@ def test_hive_error_msg(self):
         )
 
     def get_generic_database(self):
-        return Database(sqlalchemy_uri="sqlite://")
+        return Database(database_name="test_database", sqlalchemy_uri="sqlite://")
 
     def sql_limit_regex(
         self, sql, expected_sql, engine_spec_class=MySQLEngineSpec, limit=1000

tests/model_tests.py

@@ -32,7 +32,7 @@ class DatabaseModelTestCase(SupersetTestCase):
     )
     def test_database_schema_presto(self):
         sqlalchemy_uri = "presto://presto.airbnb.io:8080/hive/default"
-        model = Database(sqlalchemy_uri=sqlalchemy_uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=sqlalchemy_uri)
 
         db = make_url(model.get_sqla_engine().url).database
         self.assertEquals("hive/default", db)
@@ -41,7 +41,7 @@ def test_database_schema_presto(self):
         self.assertEquals("hive/core_db", db)
 
         sqlalchemy_uri = "presto://presto.airbnb.io:8080/hive"
-        model = Database(sqlalchemy_uri=sqlalchemy_uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=sqlalchemy_uri)
 
         db = make_url(model.get_sqla_engine().url).database
         self.assertEquals("hive", db)
@@ -51,7 +51,7 @@ def test_database_schema_presto(self):
 
     def test_database_schema_postgres(self):
         sqlalchemy_uri = "postgresql+psycopg2://postgres.airbnb.io:5439/prod"
-        model = Database(sqlalchemy_uri=sqlalchemy_uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=sqlalchemy_uri)
 
         db = make_url(model.get_sqla_engine().url).database
         self.assertEquals("prod", db)
@@ -67,7 +67,7 @@ def test_database_schema_postgres(self):
     )
     def test_database_schema_hive(self):
         sqlalchemy_uri = "hive://[email protected]:10000/default?auth=NOSASL"
-        model = Database(sqlalchemy_uri=sqlalchemy_uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=sqlalchemy_uri)
         db = make_url(model.get_sqla_engine().url).database
         self.assertEquals("default", db)
 
@@ -79,7 +79,7 @@ def test_database_schema_hive(self):
     )
     def test_database_schema_mysql(self):
         sqlalchemy_uri = "mysql://root@localhost/superset"
-        model = Database(sqlalchemy_uri=sqlalchemy_uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=sqlalchemy_uri)
 
         db = make_url(model.get_sqla_engine().url).database
         self.assertEquals("superset", db)
@@ -93,7 +93,7 @@ def test_database_schema_mysql(self):
     def test_database_impersonate_user(self):
         uri = "mysql://root@localhost"
         example_user = "giuseppe"
-        model = Database(sqlalchemy_uri=uri)
+        model = Database(database_name="test_database", sqlalchemy_uri=uri)
 
         model.impersonate_user = True
         user_name = make_url(model.get_sqla_engine(user_name=example_user).url).username

tests/sqla_models_tests.py

@@ -43,7 +43,11 @@ def test_is_time_by_type(self):
 
     def test_has_extra_cache_keys(self):
         query = "SELECT '{{ cache_key_wrapper('user_1') }}' as user"
-        table = SqlaTable(sql=query, database=get_example_database())
+        table = SqlaTable(
+            table_name="test_has_extra_cache_keys_table",
+            sql=query,
+            database=get_example_database(),
+        )
         query_obj = {
             "granularity": None,
             "from_dttm": None,
@@ -60,7 +64,11 @@ def test_has_extra_cache_keys(self):
 
     def test_has_no_extra_cache_keys(self):
         query = "SELECT 'abc' as user"
-        table = SqlaTable(sql=query, database=get_example_database())
+        table = SqlaTable(
+            table_name="test_has_no_extra_cache_keys_table",
+            sql=query,
+            database=get_example_database(),
+        )
         query_obj = {
             "granularity": None,
             "from_dttm": None,