本文整理汇总了Python中qgis.core.QgsRelation.setStrength方法的典型用法代码示例。如果您正苦于以下问题：Python QgsRelation.setStrength方法的具体用法？Python QgsRelation.setStrength怎么用？Python QgsRelation.setStrength使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsRelation的用法示例。
在下文中一共展示了QgsRelation.setStrength方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testDuplicateFeature
# 需要导入模块: from qgis.core import QgsRelation [as 别名]
# 或者: from qgis.core.QgsRelation import setStrength [as 别名]
def testDuplicateFeature(self):
""" test duplicating a feature """
project = QgsProject().instance()
# LAYERS
# - add first layer (parent)
layer1 = QgsVectorLayer("Point?field=fldtxt:string&field=pkid:integer",
"parentlayer", "memory")
# > check first layer (parent)
self.assertTrue(layer1.isValid())
# - set the value for the copy
layer1.setDefaultValueDefinition(1, QgsDefaultValue("rand(1000,2000)"))
# > check first layer (parent)
self.assertTrue(layer1.isValid())
# - add second layer (child)
layer2 = QgsVectorLayer("Point?field=fldtxt:string&field=id:integer&field=foreign_key:integer",
"childlayer", "memory")
# > check second layer (child)
self.assertTrue(layer2.isValid())
# - add layers
project.addMapLayers([layer1, layer2])
# FEATURES
# - add 2 features on layer1 (parent)
l1f1orig = QgsFeature()
l1f1orig.setFields(layer1.fields())
l1f1orig.setAttributes(["F_l1f1", 100])
l1f2orig = QgsFeature()
l1f2orig.setFields(layer1.fields())
l1f2orig.setAttributes(["F_l1f2", 101])
# > check by adding features
self.assertTrue(layer1.dataProvider().addFeatures([l1f1orig, l1f2orig]))
# add 4 features on layer2 (child)
l2f1orig = QgsFeature()
l2f1orig.setFields(layer2.fields())
l2f1orig.setAttributes(["F_l2f1", 201, 100])
l2f2orig = QgsFeature()
l2f2orig.setFields(layer2.fields())
l2f2orig.setAttributes(["F_l2f2", 202, 100])
l2f3orig = QgsFeature()
l2f3orig.setFields(layer2.fields())
l2f3orig.setAttributes(["F_l2f3", 203, 100])
l2f4orig = QgsFeature()
l2f4orig.setFields(layer2.fields())
l2f4orig.setAttributes(["F_l2f4", 204, 101])
# > check by adding features
self.assertTrue(layer2.dataProvider().addFeatures([l2f1orig, l2f2orig, l2f3orig, l2f4orig]))
# RELATION
# - create the relationmanager
relMgr = project.relationManager()
# - create the relation
rel = QgsRelation()
rel.setId('rel1')
rel.setName('childrel')
rel.setReferencingLayer(layer2.id())
rel.setReferencedLayer(layer1.id())
rel.addFieldPair('foreign_key', 'pkid')
rel.setStrength(QgsRelation.Composition)
# > check relation
self.assertTrue(rel.isValid())
# - add relation
relMgr.addRelation(rel)
# > check if referencedLayer is layer1
self.assertEqual(rel.referencedLayer(), layer1)
# > check if referencingLayer is layer2
self.assertEqual(rel.referencingLayer(), layer2)
# > check if the layers are correct in relation when loading from relationManager
relations = project.relationManager().relations()
relation = relations[list(relations.keys())[0]]
# > check if referencedLayer is layer1
self.assertEqual(relation.referencedLayer(), layer1)
# > check if referencingLayer is layer2
self.assertEqual(relation.referencingLayer(), layer2)
# > check the relatedfeatures
'''
# testoutput 1
print( "\nAll Features and relations")
featit=layer1.getFeatures()
f=QgsFeature()
while featit.nextFeature(f):
print( f.attributes())
childFeature = QgsFeature()
relfeatit=rel.getRelatedFeatures(f)
while relfeatit.nextFeature(childFeature):
print( childFeature.attributes() )
print( "\n--------------------------")
print( "\nFeatures on layer1")
for f in layer1.getFeatures():
print( f.attributes() )
print( "\nFeatures on layer2")
for f in layer2.getFeatures():
print( f.attributes() )
'''
# DUPLICATION
#.........这里部分代码省略.........