ProjectionParams

Extends: ListBase<String>

Description

The ProjectionParams class allows you to define projection parameters with a list of fields to be included in your query results.

Important points

• The parameters support two formats: dot and nested.
• The dot format is the standard way to define the included fields and subfields by using dot object notation. E.g. “field1,field2.field21,field2.field22.field221”.
• As an alternative, the nested format offers a more compact representation. E.g. “field1,field2(field21,field22(field221))".

Constructors

Creates a new instance of ProjectionParams and assigns its value.

ProjectionParams([List<dynamic>? values])

• values: List<dynamic>? - (optional) values used to initialize this object.

Instance methods

toString

Gets a string representation of the object. The result is a comma-separated list of projection fields “field1,field2.field21,field2.field22.field221”

@override

String toString()

• returns: String - string representation of the object.

Static methods

fromString

Parses a comma-separated list of projection fields.

static ProjectionParams fromString(List<dynamic> values)

• values: List<dynamic> - one or more comma-separated lists of projection fields
• returns: ProjectionParams - newly created ProjectionParams object.

fromValue

Converts a specified value into a ProjectionParams object.
See AnyValueArray.fromValue

static ProjectionParams fromValue(dynamic value)

• value: dynamic - value to be converted
• returns: ProjectionParams - newly created ProjectionParams object.

Examples

var filter = FilterParams.fromTuples(['type', 'Type1']);
var paging = new PagingParams(0, 100);
var projection = ProjectionParams.fromString('field1,field2(field21,field22)')

myDataClient.getDataByFilter(filter, paging, projection, (err, page) {...});