將模型類傳遞給函數更改行爲

Question

第一組python代碼正確導入整個CSV文件。但是，如果我嘗試將ZipMHA模型作爲參數傳遞，它只會導入CSV文件的第一行。有人可以在將模型傳遞給函數時解釋這種行爲變化嗎？

import csv 
from bah_api.models import withDependents, withOutDependents, ZipMHA 

# Populate CSV file into model 
def LoadCSV(file_location, delim): 
    f = open(file_location) 
    csv_f = csv.reader(f, delimiter=delim) 
    for row in csv_f: 
     i = 1 
     # create a model instance 
     target_model = ZipMHA() 
     #loop through the rows 
     for y in row: 
      setattr(target_model, target_model._meta.fields[i].name, y) 
      i += 1 
     # save each row 
     target_model.save() 
    f.close() 

LoadCSV("BAH2015/sorted_zipmha15.txt", ' ') 

模型作爲參數傳遞（只讀取第一行）：

# Populate CSV file into model 
def LoadCSV(file_location, my_model, delim): 
    f = open(file_location) 
    csv_f = csv.reader(f, delimiter=delim) 
    for row in csv_f: 
     i = 1 
     # create a model instance 
     target_model = my_model 
     #loop through the rows 
     for y in row: 
      setattr(target_model, target_model._meta.fields[i].name, y) 
      i += 1 
     # save each row 
     target_model.save() 
    f.close() 

LoadCSV("BAH2015/sorted_zipmha15.txt", ZipMHA(), ' ') 

Answer 1

你傳入模型實例，而不是模型類。在target_model實例的創建應該是這樣的：

target_model = my_model() # note the round brackets 

而且ZipMHA類名後不打電話括號內的函數：

LoadCSV("BAH2015/sorted_zipmha15.txt", ZipMHA, ' ')