建立一個查詢優化

Question

我這樣做在我的代碼：

programmes2 = [int(l) for l in g.getlist('programmes2')] 
if len(programmes2): 
    q = q & Q(personne__programmes2__in=programmes2) 

activites2 = [int(l) for l in g.getlist('activites2')] 
if len(activites2): 
    q = q & Q(personne__activites2__in=activites2) 

hobbies2 = [int(l) for l in g.getlist('hobbies2')] 
if len(hobbies2): 
    q = q & Q(personne__hobbies2__in=hobbies2) 

types_permis2 = [int(l) for l in g.getlist('types_permis2')] 
if len(types_permis2): 
    q = q & Q(personne__types_permis2__in=types_permis2) 

personnalites2 = [int(l) for l in g.getlist('personnalites2')] 
if len(personnalites2): 
    q = q & Q(personne__personnalites2__in=personnalites2) 

langues2 = [int(l) for l in g.getlist('langues2')] 
if len(langues2): 
    q = q & Q(personne__langues2__in=langues2) 

我想知道是否有可能變成像這樣：

for i in ['hobbies2', 'types_permis2', 'and so on']: 
    q = q & Q(personne__i__in=i) # obviously wrong, not working 

Answer 1

肯定的：

q = Q() 
for field in ["hobbies2", "types_permis2", "and so on"]: 
    values = [int(l) for l in g.getlist(field)] 

    if values:   
     field_query = "personne__{}__in".format(field) 
     q = q & Q(field_query=values) 

這是另一種方法：

fields = ["hobbies2", "types_permis2", "and so on"] 
params = {"personne__{}__in".format(field): [int(l) for l in g.getlist(field)] 
      for field in fields 
      if g.getlist(field)} 

result = MyModel.objects.filter(**params)