我正在django中開發一個應用程序。這是我的models.py和views.py代碼：Django無法隱式將'Recipe_instruction'對象轉換爲str

#models.py 
class Recipe_instruction(models.Model): 
    content = models.TextField(max_length=500) 
    recipe = models.ForeignKey(Recipe, on_delete=models.CASCADE) 
    order = models.IntegerField(max_length=500) 
    class Meta: 
      app_label='recipe_base' 
    def __str__(self): 
     return self.content

views.py

#create recipes_dict 
... 
     recipe_instructions = Recipe_instruction.objects.filter(recipe = recipe) 
     recipe_instructions_string = "" 
     for recipe_instruction in recipe_instructions: 
      recipe_instructions_string = recipe_instructions_string + recipe_instruction.content 


...

我的目標是讓所有的配方說明，並一起固定這些成一個字符串recipe_instructions_string

但是，當我跑我的views.py，它給了我下面的錯誤：

recipe_instructions_string = recipe_instructions_string + recipe_instruction.content 
TypeError: Can't convert 'Recipe_instruction' object to str implicitly

可以在你告訴我發生了什麼事？

由於recipe_instruction.content是一個文本字段，所以我不需要再次將它轉換爲一個字符串，因爲它已經是一個字符串。

TRACEBACK：

Traceback (most recent call last): 
    File "/usr/local/lib/python3.4/dist-packages/celery/app/trace.py", line 240, in trace_task 
    R = retval = fun(*args, **kwargs) 
    File "/usr/local/lib/python3.4/dist-packages/celery/app/trace.py", line 438, in __protected_call__ 
    return self.run(*args, **kwargs) 
    File "/root/worker/worker/views.py", line 500, in Task1 
    recipe_instructions_string = recipe_instructions_string + recipe_instruction.content 
TypeError: Can't convert 'Recipe_instruction' object to str implicitly

來源

2016-09-15 Elisha512

你能粘貼確切的堆棧跟蹤嗎？看起來你所顯示的代碼是錯誤發生的地方？ – karthikr

TypeError（「無法將'Recipe_instruction'對象隱式轉換爲str」）是我得到的異常。是的，我做了更改後重新啓動它 – Elisha512

Recipe_instruction>食譜指導 – allcaps

的問題不是這裏的代碼..但同時，我們正在尋找它，嘗試改變整個代碼

instructions = Recipe_instruction.objects.filter(recipe=recipe).values_list('content', 
                      flat=True) 
recipe_instructions_string = "".join(instructions)

這停止發生的錯誤，如果它在這裏，並且更高效。

來源

2016-09-15 20:56:32 Sayse

Django無法隱式將'Recipe_instruction'對象轉換爲str

views.py

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