# 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:

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](https://docs.tonic.ai/app/api/quick-start-guide/tonic-api-generator-assignment/generator-api-reference "mention"). 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.