Django error - matching query does not exist

Question

I finally released my project to the production level and suddenly I have some issues I never had to deal with in the development phase   When the users posts some actions  I sometimes get the following error   Traceback  most recent call last      File   usr local lib python2 7 dist-packages django core handlers base py   line 111  in get response     response   callback request   callback args    callback kwargs     File  home ubuntu server opineer comments views py   line 103  in comment expand     comment   Comment objects get pk comment id     File   usr local lib python2 7 dist-packages django db models manager py   line 131  in get     return self get query set   get  args    kwargs     File   usr local lib python2 7 dist-packages django db models query py   line 366  in get       self model  meta object name   DoesNotExist  Comment matching query does not exist   What really frustrates me is that the project works fine in the local environment and furthermore  the matching query object DOES exist in the Database   Now I am suspecting that the user is accessing the Database when it s reserved to other users  but there s no way to prove my argument nor I have any solution to it   Does anybody had this kind of issue before  Any suggestions on how to resolve this issue   Thank you very much for your help in advance   EDIT  I have manually queried the database using the same information retrieved from the server error email I received  I was able to hit the entry without any issue  Furthermore  it seems like the exact same behavior the user performed does not raise any issue most of the time  but rather in some  which is yet unknown  cases  In conclusion  it definitely is not an issue with the missing entry in the database

User · Answer

You can use this   comment   Comment objects filter pk comment id

User · Answer

Maybe you have no Comments record with such primary key  then you should use this code   try      comment   Comment objects get pk comment id  except Comment DoesNotExist      comment   None

User · Answer

You may try this way  just use a function to get your object  def get object self  id       try          return Comment objects get pk id      except Comment DoesNotExist          return False

User · Answer

your line raising the error is here   comment   Comment objects get pk comment id    you try to access a non-existing comment   from django shortcuts import get object or 404  comment   get object or 404 Comment  pk comment id    Instead of having an error on your server  your user will get a 404 meaning that he tries to access a non existing resource   Ok up to here I suppose you are aware of this   Some users  and I m part of them  let tabs running for long time  if users are authorized to delete data  it may happens  A 404 error may be a better error to handle a deleted resource error than sending an email to the admin   Other users go to addresses from their history   same if data have been deleted since it may happens

[database] Django error - matching query does not exist

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