Core data updating object
Suppose you want to ensure that users don't enter more than 50 characters for a name.
To add this limitation, add attribute but doesn't provide client side validation.
In the Implementing Inheritance tutorial later in this series, you'll refactor this code to eliminate the redundancy.
You can put multiple attributes on one line, so you could also write the There's a one-to-zero-or-one relationship between the Instructor and the Office Assignment entities.
In the previous tutorials, you worked with a simple data model that was composed of three entities.
In this tutorial, you'll add more entities and relationships and you'll customize the data model by specifying formatting, validation, and database mapping rules.
The database model has now changed in a way that requires a change in the database schema.
You'll use migrations to update the schema without losing any data that you may have added to the database by using the application UI. Then open the command window in the project folder and enter the following commands: command ran that code.
The same will be true for any view that uses the Student model.
When you're finished, the entity classes will make up the completed data model that's shown in the following illustration: In this tutorial, you: In this section you'll see how to customize the data model by using attributes that specify formatting, validation, and database mapping rules.
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