You can use doesntHave and specify the boolean operator: $products = Product::doesntHave(‘categories’)->doesntHave(‘countries’, ‘or’)->get(); Actually you only need whereDoesntHave if you want to pass in a closure to filter the related models before checking if any of them exist. In case you want to do that you can pass the closure as third argument: $products = … Read more
Here is what i ended up doing. I hope it helps someone. INSERT INTO persons (firstname,lastname) VALUES (‘John’,’Doe’); SET @person_id = LAST_INSERT_ID(); INSERT IGNORE INTO properties (property) VALUES (‘property_A’); SET @property_id = LAST_INSERT_ID(); INSERT INTO has_property (person_id,property_id) VALUES(@person_id, @property_id); INSERT IGNORE INTO properties (property) VALUES (‘property_B’); SET @property_id = LAST_INSERT_ID(); INSERT INTO has_property (person_id,property_id) VALUES(@person_id, … Read more
As of version 0.8, SQLAlchemy can resolve the ambiguous join using only the foreign_keys keyword parameter to relationship. publish_user = relationship(User, foreign_keys=[publishing_user_id], backref=backref(‘pages’, order_by=id)) edit_user = relationship(User, foreign_keys=[last_edit_user_id]) Documentation at http://docs.sqlalchemy.org/en/rel_0_9/orm/join_conditions.html#handling-multiple-join-paths
Install Entity Framework Power Tools Beta 4, restart Visual Studio, right-click on the context in your solution view and you’ll see a new ‘Entity Framework’ option in the context menu. Select ‘View Entity Data Model’ to see a beautiful visual database diagram in Visual Studio. Voilà! Entity Framework 6 Power Tools: Link
No, there isn’t. All relationships in neo4j have a direction, starting and ending at a given node. There are a small number of workarounds. Firstly, as you’ve suggested, we can either have two relationships, one going from A to B and the other from B to A. Alternatively, when writing our MATCH query, we can … Read more
There are 4 approaches that you can use within Elasticsearch for managing relationships. They are very well outlined in the Elasticsearch blog post – Managing Relations Inside Elasticsearch I would recommend reading the entire article to get more details on each approach and then select that approach that best meets your business needs while remaining … Read more
There are a variety of ways to do this. #1 In the query itself, you can filter models that do not have any related items: Model::has(‘posts’)->get() #2 Once you have a model, if you already have loaded the collection (which below #4 checks), you can call the count() method of the collection: $model->posts->count(); #3 If … Read more
Using sys.dm_sql_referencing_entities: SELECT referencing_schema_name, referencing_entity_name, referencing_id, referencing_class_desc, is_caller_dependent FROM sys.dm_sql_referencing_entities (‘mySchemaName.myTableName’, ‘OBJECT’); GO where ‘mySchemaName.myTableName’ is your schema.table, for example ‘dbo.MyTable’