mongoengine best way to query over a list of embedded documents with inheritance











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I have a list of embedded documents which I create using inheritance. Therefore, due to inheritance, some fields may not exist across all embedded documents. I have tried the following:



CASE 1: SLOW (run time = 2.1s)



forms = db.Form.objects()

for form in forms:

    for element in form.elements:

        if hasattr(element, 'parameter'):

            if element.parameter == parameter:

                print(form)


CASE 2: FAST (run time = 0.00014s)



forms = db.Form.objects(elements__match={ 'parameter': parameter })


CASE 3: DOES NOT WORK!



forms = db.Form.objects(elements__parameter == parameter)



NameError: name 'elements__parameter' is not defined


I would think that CASE 2 and 3 would be identical, however, it seems that the __parameter does not know how to deal with embedded documents which use inheritance and do not have the 'parameter' field. Is this a bug or am I doing something wrong?






mongoengine flask-mongoengine







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    up vote
    0
    down vote

    favorite












    I have a list of embedded documents which I create using inheritance. Therefore, due to inheritance, some fields may not exist across all embedded documents. I have tried the following:



    CASE 1: SLOW (run time = 2.1s)



    forms = db.Form.objects()
    
for form in forms:
    
    for element in form.elements:
    
        if hasattr(element, 'parameter'):
    
            if element.parameter == parameter:
    
                print(form)


    CASE 2: FAST (run time = 0.00014s)



    forms = db.Form.objects(elements__match={ 'parameter': parameter })


    CASE 3: DOES NOT WORK!



    forms = db.Form.objects(elements__parameter == parameter)
    

    
NameError: name 'elements__parameter' is not defined


    I would think that CASE 2 and 3 would be identical, however, it seems that the __parameter does not know how to deal with embedded documents which use inheritance and do not have the 'parameter' field. Is this a bug or am I doing something wrong?






    mongoengine flask-mongoengine







    share|improve this question


























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a list of embedded documents which I create using inheritance. Therefore, due to inheritance, some fields may not exist across all embedded documents. I have tried the following:



      CASE 1: SLOW (run time = 2.1s)



      forms = db.Form.objects()
      
for form in forms:
      
    for element in form.elements:
      
        if hasattr(element, 'parameter'):
      
            if element.parameter == parameter:
      
                print(form)


      CASE 2: FAST (run time = 0.00014s)



      forms = db.Form.objects(elements__match={ 'parameter': parameter })


      CASE 3: DOES NOT WORK!



      forms = db.Form.objects(elements__parameter == parameter)
      

      
NameError: name 'elements__parameter' is not defined


      I would think that CASE 2 and 3 would be identical, however, it seems that the __parameter does not know how to deal with embedded documents which use inheritance and do not have the 'parameter' field. Is this a bug or am I doing something wrong?






      mongoengine flask-mongoengine







      share|improve this question















      I have a list of embedded documents which I create using inheritance. Therefore, due to inheritance, some fields may not exist across all embedded documents. I have tried the following:



      CASE 1: SLOW (run time = 2.1s)



      forms = db.Form.objects()
      
for form in forms:
      
    for element in form.elements:
      
        if hasattr(element, 'parameter'):
      
            if element.parameter == parameter:
      
                print(form)


      CASE 2: FAST (run time = 0.00014s)



      forms = db.Form.objects(elements__match={ 'parameter': parameter })


      CASE 3: DOES NOT WORK!



      forms = db.Form.objects(elements__parameter == parameter)
      

      
NameError: name 'elements__parameter' is not defined


      I would think that CASE 2 and 3 would be identical, however, it seems that the __parameter does not know how to deal with embedded documents which use inheritance and do not have the 'parameter' field. Is this a bug or am I doing something wrong?






      mongoengine flask-mongoengine




      mongoengine flask-mongoengine






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 9 at 22:20

























      asked Nov 9 at 21:53









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