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Fields on Forest can either use Primitive Types or Composite Types.

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Primitive types

The primitive types which are supported by Forest are the following:
Forest TypeLanguage Type
BooleanBoolean
DateString with format “1985-10-26T01:22:00-08:00Z” (ISO-8601)
DateonlyString with format “1985-10-26”
EnumString
JSONAny JSON compatible value
NumberNumber
PointArray of 2 Numbers
StringString
TimeonlyString with format “01:22:00”
UuidString with uuid v4 format

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Composite types

  • Fields using composite types are not sortable and do not implement validation.
  • Fields that are an array of a primitive type only are filterable (depending on the data source).
// Object containing 2 strings
const typeOfObjectWithTwoStrings = { firstName: 'String', lastName: 'String' };

// Array of strings
const typeOfArrayOfStrings = ['String'];

// Array of objects
const typeOfArrayOfObjects = [{ content: 'String' }];

// Object containing a 2d-grid of numbers
const typeOfObjectContainingAGridOfNumbers = { content: [['Number']] };
When using composite types, the data in the UI may not be displayed as you expect!
Composite TypeExampleHow it gets displayed
Array of primitive type[ 'array', 'of', 'strings']As a custom widget in the edition form
Object{ title: "the godfather"}As a nested form in the edition form
Array of object[{ title: "the shawshank redemption"}]As a new collection in Related Data section
Array of object (with nested objects)[{ rating: { kind: 'MPA", value: "PG-13" } }]JSON editor in the edition form
Anything elseJSON editor in the edition form
If you want to force displaying your data as a new Collection in the Related Data section, but can’t because your data model contains nested objects, you may consider typing all nested objects as 'JSON'.