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How to test for previously joined layers before run a code

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0

I've a function that join two added layers. The code works fine, but now I need to test for previously joined layers before run this function. The function code is right below:

def jointables(dict): # this dict provides [targetLayer:layerToJoin]

  for k, v in dict.items():

    target = QgsProject.instance().mapLayer(k)

    layerToJoin = QgsProject.instance().mapLayer(v)

    fieldToJoin = QgsProject.instance()

    symb = QgsVectorLayerJoinInfo()

    symb.setJoinFieldName('id_feature')

    symb.setTargetFieldName('id')

    symb.setJoinLayerId(layerToJoin.id())

    symb.setEditable(True)

    symb.setDynamicFormEnabled(True)

    symb.setUpsertOnEdit(True)

    symb.setPrefix('')

    symb.setJoinLayer(layerToJoin)

    target.addJoin(symb)

I've tried some things like this:

for k, v in dict.items():

    if QgsProject.instance().mapLayer(k).addJoin(QgsVectorLayerJoinInfo()) == True:

        break

    else:

        continue

or

for k, v in dict.items():

    if QgsVectorLayerJoinInfo().isEditable() == True:

       break

    else:

       continue

among others. I've missing something. Both conditionals has the same value True, doesnt matter if already exists an previously joined layer or not. How can I solve this?

qgis pyqgis pyqgis-3

share|improve this question

edited 5 mins ago

Francisco Camello

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

add a comment | 

0

I've a function that join two added layers. The code works fine, but now I need to test for previously joined layers before run this function. The function code is right below:

def jointables(dict): # this dict provides [targetLayer:layerToJoin]

  for k, v in dict.items():

    target = QgsProject.instance().mapLayer(k)

    layerToJoin = QgsProject.instance().mapLayer(v)

    fieldToJoin = QgsProject.instance()

    symb = QgsVectorLayerJoinInfo()

    symb.setJoinFieldName('id_feature')

    symb.setTargetFieldName('id')

    symb.setJoinLayerId(layerToJoin.id())

    symb.setEditable(True)

    symb.setDynamicFormEnabled(True)

    symb.setUpsertOnEdit(True)

    symb.setPrefix('')

    symb.setJoinLayer(layerToJoin)

    target.addJoin(symb)

I've tried some things like this:

for k, v in dict.items():

    if QgsProject.instance().mapLayer(k).addJoin(QgsVectorLayerJoinInfo()) == True:

        break

    else:

        continue

or

for k, v in dict.items():

    if QgsVectorLayerJoinInfo().isEditable() == True:

       break

    else:

       continue

among others. I've missing something. Both conditionals has the same value True, doesnt matter if already exists an previously joined layer or not. How can I solve this?

qgis pyqgis pyqgis-3

share|improve this question

edited 5 mins ago

Francisco Camello

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

add a comment | 

I've a function that join two added layers. The code works fine, but now I need to test for previously joined layers before run this function. The function code is right below:

def jointables(dict): # this dict provides [targetLayer:layerToJoin]

  for k, v in dict.items():

    target = QgsProject.instance().mapLayer(k)

    layerToJoin = QgsProject.instance().mapLayer(v)

    fieldToJoin = QgsProject.instance()

    symb = QgsVectorLayerJoinInfo()

    symb.setJoinFieldName('id_feature')

    symb.setTargetFieldName('id')

    symb.setJoinLayerId(layerToJoin.id())

    symb.setEditable(True)

    symb.setDynamicFormEnabled(True)

    symb.setUpsertOnEdit(True)

    symb.setPrefix('')

    symb.setJoinLayer(layerToJoin)

    target.addJoin(symb)

I've tried some things like this:

for k, v in dict.items():

    if QgsProject.instance().mapLayer(k).addJoin(QgsVectorLayerJoinInfo()) == True:

        break

    else:

        continue

or

for k, v in dict.items():

    if QgsVectorLayerJoinInfo().isEditable() == True:

       break

    else:

       continue

among others. I've missing something. Both conditionals has the same value True, doesnt matter if already exists an previously joined layer or not. How can I solve this?

qgis pyqgis pyqgis-3

share|improve this question

edited 5 mins ago

Francisco Camello

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

def jointables(dict): # this dict provides [targetLayer:layerToJoin]

  for k, v in dict.items():

    target = QgsProject.instance().mapLayer(k)

    layerToJoin = QgsProject.instance().mapLayer(v)

    fieldToJoin = QgsProject.instance()

    symb = QgsVectorLayerJoinInfo()

    symb.setJoinFieldName('id_feature')

    symb.setTargetFieldName('id')

    symb.setJoinLayerId(layerToJoin.id())

    symb.setEditable(True)

    symb.setDynamicFormEnabled(True)

    symb.setUpsertOnEdit(True)

    symb.setPrefix('')

    symb.setJoinLayer(layerToJoin)

    target.addJoin(symb)

for k, v in dict.items():

    if QgsProject.instance().mapLayer(k).addJoin(QgsVectorLayerJoinInfo()) == True:

        break

    else:

        continue

for k, v in dict.items():

    if QgsVectorLayerJoinInfo().isEditable() == True:

       break

    else:

       continue

share|improve this question

edited 5 mins ago

Francisco Camello

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

share|improve this question

edited 5 mins ago

Francisco Camello

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

asked 21 hours ago

Francisco CamelloFrancisco Camello

425

asked 21 hours ago

Francisco CamelloFrancisco Camello

425