# Structure of a generator preset

The [`PresetSummary`](https://app.tonic.ai/apidocs/index.html#/models/PresetSummary) object is used in requests and responses to provide details about a generator preset.

## **High-level structure overview**

At a very high level, the general structure of a generator preset is:

<figure><img src="/files/RONVCLPVTgzbRDDAUIXD" alt=""><figcaption><p>Structure of a generator preset</p></figcaption></figure>

Each generator preset object contains:

* Identifying information for the generator preset.
* Information about who most recently modified the generator preset.
* The generator configuration for the generator preset.
* When the generator preset was created and most recently modified.

## **Identifying information for the generator preset**

`id` is the generator preset identifier. When you create a generator preset, Tonic Structural provides the identifier for it in the response. You use the identifier to select a generator preset to update, delete, or assign to a column.

`name` is the name that you assign to the generator preset, and `description` allows you to provide additional information about the generator preset.

`generatorId` identifies the type of generator for the generator preset.

`isBuiltIn` indicates whether this is a built-in generator preset, and is only included in responses. For a built-in generator preset, `id` and `generatorId` are the same value. You can update a built-in preset, but you cannot delete a built-in generator preset.

## **Information about who most recently modified the generator preset**

`lastModifiedByUser` identifies who most recently modified the generator preset configuration.

The user information includes the user's identifier, first name, last name, and email address.

## **Generator configuration**

The `metadata` object contains the generator configuration for the generator preset.

For details about the metadata for each generator, go to the [Generator API reference](/app/api/quick-start-guide/tonic-api-generator-assignment/generator-api-reference.md).

Generator presets do not include the following configuration options:

* Linking
* Consistency with another column
* Partitioning
* Custom value processors

You always set those configuration options in the column configuration.

## **Creation and update dates**

`createdDate` and `lastModifiedDate` indicate when the generator preset was created and when it was most recently updated.


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