def vector_layer(self):
"""
Returns a QgsVectorLayer based on the configuration information
specified in the mapper including the system-wide data connection
properties.
"""
from stdm.data import vector_layer
if self._dbModel is None:
msg = QApplication.translate("ForeignKeyMapper",
"Primary database model object not defined.")
return None, msg
filter_layer = vector_layer(self._ds_name)
if filter_layer is None:
msg = QApplication.translate("ForeignKeyMapper",
"Vector layer could not be constructed from the database table.")
return None, msg
if not filter_layer.isValid():
trans_msg = QApplication.translate("ForeignKeyMapper",
u"The vector layer for '{0}' table is invalid.")
msg = trans_msg.format(self._ds_name)
return None, msg
return filter_layer, ""
def load_table_layers(config_collection):
"""
In order to be able to use attribute tables in the composition, the
corresponding vector layers need to be added to the layer
registry. This method creates vector layers from the linked tables
in the configuration items. This is required prior to creating the
composition from file.
:param config_collection: Table configuration collection built from
the template file.
:type config_collection: TableConfigurationCollection
:returns: Valid layers that have been successfully added to the
registry.
:rtype: list
"""
table_configs = config_collection.items().values()
v_layers = []
for conf in table_configs:
layer_name = conf.linked_table()
v_layer = vector_layer(layer_name)
if v_layer is None:
return
if not v_layer.isValid():
return
v_layers.append(v_layer)
QgsMapLayerRegistry.instance().addMapLayers(v_layers, False)
return v_layers
def set_table_vector_layer(self, table_name):
"""
Creates a vector layer and appends it to the composer table item.
:param table_name: Name of the linked table containing tabular
information.
:type table_name: str
"""
self._notif_bar.clear()
if not table_name:
return
v_layer = vector_layer(table_name)
if v_layer is None:
msg = QApplication.translate("ComposerTableDataSourceEditor",
"A vector layer could not be created from the table.")
self._notif_bar.insertErrorNotification(msg)
return
if not v_layer.isValid():
msg = QApplication.translate("ComposerTableDataSourceEditor",
"Invalid vector layer, the table will not be added.")
self._notif_bar.insertErrorNotification(msg)
return
#No need to add the layer in the legend
QgsMapLayerRegistry.instance().addMapLayer(v_layer, False)
self._composer_table_item.setVectorLayer(v_layer)
self._composer_table_item.update()
