Class: QgsFieldMappingModel¶

Holds mapping information for mapping from one set of QgsFields to another.

For each set of “destination” fields an expression defines how to obtain the values of the “destination” fields.

The model can be optionally set “editable” allowing to modify all the fields, by default only the mapping expression is editable.

Added in version 3.14.

Class Hierarchy¶

Base classes¶

QAbstractTableModel
QAbstractItemModel
QObject

Enums

ColumnDataIndex

The ColumnDataIndex enum represents the column index for the view

Methods

`appendField`	Appends a new field to the model, with an optional expression
`contextGenerator`	Returns the context generator with the source fields
`dataTypes`	Returns a static map of supported data types
`destinationEditable`	Returns `True` if the destination fields are editable
`fieldPropertyMap`	Returns a map of destination field name to `QgsProperty` definition for field value, representing the current status of the model.
`mapping`	Returns a list of Field objects representing the current status of the model
`moveDown`	Moves up the field at index
`moveUp`	Moves down the field at index
`removeField`	Removes the field at index from the model, returns `True` on success
`setBaseExpressionContextGenerator`	Sets the base expression context generator, which will generate the expression contexts for expression based widgets used by the model.
`setDestinationEditable`	Sets the destination fields editable state to editable
`setDestinationFields`	Set destination fields to destinationFields, initial values for the expressions can be optionally specified through expressions which is a map from the original field name to the corresponding expression.
`setFieldPropertyMap`	Sets a map of destination field name to `QgsProperty` definition for field value.
`setNativeTypes`	Sets the list of nativeTypes supported by a data provider.
`setSourceFields`	Set source fields to sourceFields
`sourceFields`	Returns a list of source fields
`supportedDataTypes`	Returns a static list of supported data types

class qgis.gui.QgsFieldMappingModel[source]¶

Bases: QAbstractTableModel

__init__(sourceFields: QgsFields = QgsFields(), destinationFields: QgsFields = QgsFields(), expressions: Dict[str | None, str | None] = {}, parent: QObject | None = None)

Constructs a QgsFieldMappingModel from a set of sourceFields and destinationFields, initial values for the expressions can be optionally specified through expressions which is a map from the original field name to the corresponding expression. A parent object can be also specified.

Parameters:

sourceFields (QgsFields = QgsFields())
destinationFields (QgsFields = QgsFields())
expressions (Dict[Optional[str], Optional[str]] = {})
parent (Optional[QObject] = None)

class ColumnDataIndex(*values)¶

Bases: IntEnum

The ColumnDataIndex enum represents the column index for the view

SourceExpression: Expression
DestinationName: Destination field name
DestinationType: Destination field type string
DestinationLength: Destination field length
DestinationPrecision: Destination field precision
DestinationConstraints: Destination field constraints
DestinationAlias: Destination alias
DestinationComment: Destination comment

DestinationAlias = 6¶

DestinationComment = 7¶

DestinationConstraints = 5¶

DestinationLength = 3¶

DestinationName = 1¶

DestinationPrecision = 4¶

DestinationType = 2¶

SourceExpression = 0¶

class Field¶

Bases: object

The Field struct holds information about a mapped field

expression: str¶: The expression for the mapped field from the source fields

field: QgsField¶: The field in its current status (it might have been renamed)

originalName: str¶: The original name of the field

appendField(self, field: QgsField, expression: str | None = '')[source]¶

Appends a new field to the model, with an optional expression

Parameters:

field (QgsField)
expression (Optional[str] = '')

contextGenerator(self) → QgsExpressionContextGenerator | None[source]¶

Returns the context generator with the source fields

Return type:: Optional[QgsExpressionContextGenerator]

dataTypes() → Dict[QMetaType.Type, str]¶

Returns a static map of supported data types

Deprecated since version 3.24: Use supportedDataTypes() instead.

Return type:: Dict[QMetaType.Type, str]

destinationEditable(self) → bool[source]¶

Returns True if the destination fields are editable

Return type:: bool

fieldPropertyMap(self) → Dict[str, QgsProperty]¶

Returns a map of destination field name to QgsProperty definition for field value, representing the current status of the model.