Class: QgsMapLayerDependency

This class models dependencies with or between map layers.

A dependency is defined by a layer ID, a type and an origin. The two combinations of type/origin that are currently supported are:

• PresenceDependency && FromProvider: virtual layers for instance which may depend on other layers already loaded to work

• DataDependency && FromUser: dependencies given by the user, mainly to represent database triggers

Methods

layerId	Returns the ID of the layer this dependency depends on
origin	Returns the dependency origin
type	Returns the dependency type

Attributes

DataDependency
FromProvider
FromUser
PresenceDependency

class qgis.core.QgsMapLayerDependency

Bases: object

__init__(layerId: str | None, type: QgsMapLayerDependency.Type = QgsMapLayerDependency.DataDependency, origin: QgsMapLayerDependency.Origin = QgsMapLayerDependency.FromUser)

Standard constructor

Parameters:

• layerId (Optional[str])

• type (QgsMapLayerDependency.Type = QgsMapLayerDependency.DataDependency)

• origin (QgsMapLayerDependency.Origin = QgsMapLayerDependency.FromUser)

__init__(a0: QgsMapLayerDependency)

Parameters:

a0 (QgsMapLayerDependency)

DataDependency = 2

FromProvider = 0

FromUser = 1

class Origin

Bases: int

PresenceDependency = 1

class Type

Bases: int

layerId(self) → str

Returns the ID of the layer this dependency depends on

Return type:

str

origin(self) → QgsMapLayerDependency.Origin

Returns the dependency origin

Return type:

QgsMapLayerDependency.Origin

type(self) → QgsMapLayerDependency.Type

Returns the dependency type

Return type:

QgsMapLayerDependency.Type