django：從postgres數據庫導入數據時無法修改錯誤

Question

從轉儲數據安裝燈具時出現奇怪的錯誤。我正在使用psycopg2和django1.1.1

silver:probsbox oleg$ python manage.py loaddata /Users/oleg/probs.json 
Installing json fixture '/Users/oleg/probs' from '/Users/oleg/probs'. 
Problem installing fixture '/Users/oleg/probs.json': Traceback (most recent call last): 
    File "/opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py", line 153, in handle 
    obj.save() 
    File "/opt/local/lib/python2.5/site-packages/django/core/serializers/base.py", line 163, in save 
    models.Model.save_base(self.object, raw=True) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/base.py", line 495, in save_base 
    result = manager._insert(values, return_id=update_pk) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/manager.py", line 177, in _insert 
    return insert_query(self.model, values, **kwargs) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/query.py", line 1087, in insert_query 
    return query.execute_sql(return_id) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/sql/subqueries.py", line 320, in execute_sql 
    cursor = super(InsertQuery, self).execute_sql(None) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/sql/query.py", line 2369, in execute_sql 
    cursor.execute(sql, params) 
    File "/opt/local/lib/python2.5/site-packages/django/db/backends/util.py", line 19, in execute 
    return self.cursor.execute(sql, params) 
ProgrammingError: can't adapt 

首先我檢查了互聯網上的類似問題。這一個似乎非常有關：http://code.djangoproject.com/ticket/5996，因爲我的數據有許多非ASCII符號

但實際上我已經檢查了我的Django的安裝和它的確定有

難道你的建議是什麼錯誤

= ===

根據第一個答案建議的添加打印語句後繼續調查。日誌看起來是這樣的：從最後評論

silver:probsbox oleg$ python manage.py loaddata /Users/oleg/probs.json 
Installing json fixture '/Users/oleg/probs' from '/Users/oleg/probs'. 
<DeserializedObject: Novice> 
<DeserializedObject: Junior> 
<DeserializedObject: Chess enthusiast> 
<DeserializedObject: Experienced player > 
<DeserializedObject: Smart player> 
Problem installing fixture '/Users/oleg/probs.json': Traceback (most recent call last): 
    File "/opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py", line 153, in handle 
    print obj 
    File "/opt/local/lib/python2.5/site-packages/django/core/serializers/base.py", line 155, in __repr__ 
    return "<DeserializedObject: %s>" % smart_str(self.object) 
    File "/opt/local/lib/python2.5/site-packages/django/utils/encoding.py", line 107, in smart_str 
    return str(s) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/base.py", line 335, in __str__ 
    return force_unicode(self).encode('utf-8') 
    File "/opt/local/lib/python2.5/site-packages/django/utils/encoding.py", line 71, in force_unicode 
    s = unicode(s) 
    File "/Users/oleg/Sites/probsbox/registration/models.py", line 58, in __unicode__ 
    return u"%s's profile" %(self.user.username) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/fields/related.py", line 257, in __get__ 
    rel_obj = QuerySet(self.field.rel.to).get(**params) 
    File "/opt/local/lib/python2.5/site-packages/django/db/models/query.py", line 305, in get 
    % self.model._meta.object_name) 
DoesNotExist: User matching query does not exist. 

silver:probsbox oleg$ 

錯誤

<DeserializedObject: qwert2000's profile> 

問題安裝夾具 '/Users/oleg/probs.json'：回溯（最近通話最後一個）： 文件「/ opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py「，第154行，在句柄 obj.save（） 文件」/ opt/local/lib/python2。 5/site-packages/django/core/serializers/base.py「，第163行，保存爲 models.Model.save_base（self.object，raw = True） File」/ op t/local/lib/python2.5/site-packages/django/db/models/base.py「，第495行，在save_base result = manager._insert（values，return_id = update_pk） 」/ opt/local /lib/python2.5/site-packages/django/db/models/manager.py「，第177行，在_insert中 return insert_query（self.model，values，** kwargs） 」/ opt/local/lib /python2.5/site-packages/django/db/models/query.py「，第1087行，在insert_query中 return query.execute_sql（return_id） 文件」/opt/local/lib/python2.5/site-packages /django/db/models/sql/subqueries.py「，第320行，在execute_sql中 cursor = super（InsertQuery，self）.execute_sql（None） 文件」/opt/local/lib/python2.5/site-packages /django/db/models/sql/query.py「，第2369行，在execute_sql中 cursor.execute（sql，par ams） 文件「/opt/local/lib/python2.5/site-packages/django/db/backends/util.py」，第19行，執行 return self.cursor.execute（sql，params） ProgrammingError ：不能適應

Answer 1

好吧，我最終從我的數據庫複製轉儲，並在本地恢復它沒有巨蟒...

Answer 2

can't adapt錯誤是由psycopg2引發的，當它接收到一個數據類型時，它不知道如何轉換爲SQL語句的值。例如，如果您不小心傳遞了一個列表，比如說，應該是一個整數的值，psycopg2將會引發這個錯誤。

的faq.txt文件附帶psycopg2的源代碼分發這樣解釋道：

Why does !cursor.execute() raise the exception can't adapt?

Psycopg converts Python objects in a SQL string representation by looking at the object class. The exception is raised when you are trying to pass as query parameter an object for which there is no adapter registered for its class. See :ref: adapting-new-types for informations.

可能是你最好先通在發現錯誤的值是在充分詳細模式運行loaddata：蟒蛇管理的.py loaddata --verbosity = 2 /Users/oleg/probs.json

嗯，我希望loaddata冗長會工作，我也不會承認，我從來沒有發現調試適應的一種優雅的方式Django的loaddata錯誤。在過去，我已經在django的loaddata函數中插入了打印語句，以便在出現錯誤時可以看到值被反序列化。我編輯了django/core/management/loaddata.py。看obj.save()在handle()功能。我希望這表白激勵別人分享:-)

一個更好的解決方案