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Sometimes it can be very useful to have the option to assign attributes of one object to another object, e.g. if some data is not consistent or simply if an attribute is missing and exists within another object. This operation can be accomplished by configuring object assignment layers in the project configuration.

 

Note: Since assigning of an object is an editing operation the project selected for object assignment must be suitable for editing. Therefore, it needs to meet all the preconditions which are defined in chapter Edit Layers.

 

Note: So far the "Assign feature" tool is only supported by the WebOffice mobile client. For more information about how to use the "Assign feature" tool, please see chapter Assign Feature.

 

The following configuration shall be described with an easy example. Granted that there exist two layers, one polygon layer representing parcels of a settlement and a point layer with one object per parcel where several attributes of the parcels are saved. Now the attribute parcel number of the point layer should be assigned to the polygon layer.

 

In order to enable object assignment the following steps have to be performed:

 

•Configure an edit layer which will serve as the target layer of the object assignment. Thus, there needs to exist at least the Edit field where the assigned attribute will be written into. In the next step the minimum required edit actions are "Assign" and "Edit". Finally it is necessary to define an object assignment layer which points to the source layer of the attribute to be assigned.
With the example above, the polygon layer with the parcels is the target layer to be edited. The attribute "parcel number" will be written into the edit field GNR. The point layer will be used as the object assignment layer since it is the origin of the attribute "parcel number".

 

 

•In the next step it is necessary to define layer queries for at least two layers with one layer providing the attribute to be assigned and the other one serving as target layer for the assignment. Therefore, the attribute to be assigned needs to be configured as search field in the source layer. A list of predefined queries or a full text search can be useful if objects to be assigned are far away from each other in the map. Additionally, an object assignment needs to be configured within the source layer defining its primary key field and the foreign key field of the target layer. Using object assignment the primary key field gets read and stored to the foreign key field of the defined edit layer. Finally, another layer query has to be configured for the target layer including search and result fields at least for the editable field.
The "parcel number" attribute GNR of the point layer will be configured as search and result field together with a predefined query. Additionally, the node object assignment defines the "parcel number" GNR as primary key field. The "parcel number" field GNR of the target polygon layer will serve as foreign key field. For the target polygon layer two search and result fields will be defined representing the parcel number GNR and the parcel name KG_Name.