> For the complete documentation index, see [llms.txt](https://appmaster.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://appmaster.gitbook.io/docs/data-design/data-models-designer/creating-and-modifying-data-models.md).

# Creating and modifying data models

Working with the Data Model Designer

## Create data model

To create **a new data model**, right-click on an empty space in the designer field and select *`Create empty model`*. Enter a title (required) and description (optional). Click *`Save`*. A new model has appeared in the designer's field. 

To **delete a data model**, right-click on it and press *`Delete`*.

![](https://3563768697-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MapxHzVskQ_27pNUTT4%2F-MgldvlT-K8bgfMsIb3x%2F-Mgle5CrD9asbVGDjP9-%2F1-create_model.gif?alt=media\&token=7545fe6e-80a4-442c-9b0f-8495c7727f7f)

## Create data model field 

To create **a new field**, point to the "+" at the bottom of the data model and click the *`Add field`* caption that appears. 

A modal window will open with the settings for the new model:

* **Field name** — (required); 
* **Field type** —  (required; see the list of data types);
* **Description** — (optional);
* **Multiple values (Array)** — whether the field will be an array;
* **Not null** — the field will be required when creating an object;
* **Unique** — the field value must be unique for each object;
* **Index** — the field needs to be assigned an index (this will speed up the search in your database, but will increase its volume).

Click *`Save`* to save your changes. The field name and its type will be displayed in the data model.

To **delete a field**, right-click on it and press *`Delete`*.

![](https://3563768697-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MapxHzVskQ_27pNUTT4%2F-MgldvlT-K8bgfMsIb3x%2F-MgleJQt1P_FLrZdL1kQ%2F2-create_field.gif?alt=media\&token=d496b982-c16b-4bb5-b5cf-55d35cee73e3)

## Related items 

### Business process blocks 

Each data model, when created, adds its own **blocks of business processes**. AppMaster Studio will automatically place them in the following block groups: 

* Model function - Model\_name; 
* Models. 

**Example:** 

Create a data model, name it **My\_model**.

![](https://3563768697-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MapxHzVskQ_27pNUTT4%2F-Mh-mNdlTnFk_7771eS8%2F-Mh-nXG5BLtsHBvwM_QM%2Fimage.png?alt=media\&token=c1e11158-f7bc-41db-82f9-9a43a10cf576)

Go to the business process editor. In the general list, you will see the blocks of the model you created, the name of each of them will necessarily contain "My\_model".

![](https://3563768697-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MapxHzVskQ_27pNUTT4%2F-Mh-_nt4mxqmHPdaH2Rr%2F-Mh-lHTZYbGT4djgP4bt%2Fimage.png?alt=media\&token=20155c89-57ff-45de-881f-a71766e35064)