System fields

All default, and custom content types come with some managed system fields. These fields reflect certain states of your content, such as when it was last updated, or published at.

#Default model fields

These fields are included with all content models you create within Hygraph.

Field	Type	Description
`id`	`ID!`	Unique for each content entry
`createdAt`	`DateTime!`	Timestamp for when the content entry was created
`createdBy`	`User`	The user who created the content entry
`updatedAt`	`DateTime!`	Timestamp for when the content entry was updated
`updatedBy`	`User`	The user who last updated the content entry
`publishedAt`	`DateTime!`	Timestamp for when the content entry was published
`publishedBy`	`User`	The user who last published the content entry
`documentInStages`	`[model]`	Query the current document in other stages

#User fields

Since the User model is included with every project, it also comes with some predefined fields, as well as all of the system fields above (but not createdBy, updatedBy, and publishedBy).

The User model is part of "user attribution", and is connected with content entries. This connection allows you to see who created, updated, and published content entries.

Field	Type	Description
`id`	`ID!`	The ID of the user
`name`	`String!`	The name of the user
`picture`	`String`	The profile picture URL
`kind`	`UserKind!`	The type of user - either `MEMBER`, `PAT`, or `PUBLIC`
`createdAt`	`DateTime!`	The created at date and time of the user
`updatedAt`	`DateTime!`	The last updated at date and time of the user
`publishedAt`	`DateTime`	The last published at date and time of the user

If content is mutated with a Permanent Auth Token then kind will return PAT.
If Public API Permissions are enabled, and content is mutated, kind will return PUBLIC.

All users will currently be members of your project. In the future they can be external users, part of a user authentication API.

Created by

Updated by

Published by

#Asset fields

Since the Asset model is included with every project, it also comes with some predefined fields, as well as all of the system fields above.

The Asset field type has all of the default model fields, as well as:

Field	Type	Description
`url`	`String!`	The URL of the asset, with any transformations.
`handle`	`String!`	The file handle.
`fileName`	`String!`	The document file name that was uploaded.
`height`	`Float`	The height of the file (for images only).
`width`	`Float`	The width of the file (for images only).
`size`	`Float`	The total file size.
`mimeType`	`String`	The mime type of the file.
`locale`	`Locale!`	The system locale enumeration for your projects locales. E.g. `en`, `de`.
`localizations`	`[Asset!]!`	An array of localized assets for the asset you are querying.

Asset fields are localized by default, and always include the localization fields described below.

Pro Tip

While the Assets model is a system model that comes with every project by default and contains some predefined fields, you can still edit it to add fields for things like alt text and captions to your image assets.

Click here to learn more about adding fields to a model.

#Localization fields

When you localize fields within Hygraph, the model will be updated to contain the following fields:

Field	Type	Description
`locale`	`Locale!`	The system locale enumeration for your projects locales. E.g. `en`, `de`.
`localizations`	`[modelName!]!`	An array of localized entries for the model you are querying.

Learn more about working with Localization.

#Version history fields

One of the auto-generated queries Hygraph will create is around versioning. Each time you publish content to a stage, a version is saved.

You can fetch the version history of a content entry by using the history field on a model. This field is managed automatically by Hygraph.

Field	Type	Description
`id`	`ID!`	The `id` of the content entry you are querying.
`stage`	`Stage!`	The content stage the content entry was published to. E.g. `PUBLISHED`.
`revision`	`Int!`	The revision number. Auto incrementing from `1`.
`createdAt`	`DateTime!`	The timestamp when the version was created.

Query

#Connection type fields

Since Hygraph implements the Relay specification, when fetching with Relay you will have some fields made available to you automatically.

For example, let's imagine we have the model Post. The postsConnection would look a little something like:

Field	Type	Description
`edges`	`[PostEdge!]!`	A list of edges, containing cursor, and the node.
`pageInfo`	`PageInfo!`	Information used for paginating nodes.
`aggregate`	`Aggregate!`	The count of records, relative to any filters.

#[PostEdge!]!

Field	Type	Description
`cursor`	`String!`	The edge cursor, used for paginating records.
`node`	`Post!`	The actual entry of the record, for example the `Post` entry.

Query

#PageInfo!

Hygraph exposes the PageInfo type on the field pageInfo for connection queries. This is useful with cursor based pagination.

Field	Type	Description
`hasNextPage`	`Boolean!`	When paginating forwards, are there more items?
`hasPreviousPage`	`Boolean!`	When paginating backwards, are there more items?
`startCursor`	`String`	When paginating backwards, the cursor to continue
`endCursor`	`String`	When paginating forwards, the cursor to continue
`pageSize`	`Int`	The number of items in the current page

Query

Learn more about Relay cursor pagination.

#Aggregate!

It is possible using the connection type query to perform an aggregate count.

Field	Type	Description
`count`	`Int!`	The count of results matching the query, and filters.

Query