Have a look on relational data browse and the virtual foreign keys there, Under the main folder we have subfolders that have one to many (1:) relationship with the main folder. But you can put your own unique value for id and Mongodb will use it instead of making one for you. Professor can select their department and add the main folder if they want. Mongodb use an internal ObjectId value if you don't define it in your object and also create an index to ensure performance. Now I am dealing with virtual foreign key from them, to explore data from two collections bind referencing one the other via ObjectId’s.Look for DbSchema tool, is great for the diagrams they do for MongoDB, query builder and data explorer.Some features you may discover inside like virtual foreign keys makes the interaction really similar with relational databases, where you can place data in multiple collections and join it with ObjectId’s.I was surprised to see is possible to have diagrams for MongoDB as well, as for any relational database. In mongodb id field is reserved for primary key. Second I found great an data explorer from them, where you can explore data from each collection and sub-documents in a separate window. First of all I was impressed because they do diagrams for MongoDB. The root mapping may set its child mapping for the field id to be used as primary key (see context menu), as long as it maps to a single column of the main table. Nice tutorial, and recently I discovered a tool simply called DbSchema ( ). All tables created by the mapping will at least get an automatic primary key column that increments an integer value starting at zero.
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