matching query does not exist Error in Django

Question

I have implemented a password recovery functionality in django  With my method  the new password will be sent to the email id entered  It works fine when given the correct email  e-mail id which exists in the database   But when given an email id which is not in the database  it gives the error   DoesNotExist at  forgotPassword   UniversityDetails matching query does not exist   How can I resolve this issue  forgotPassword html   def forgotPassword request       if request POST          email request POST get  quot email quot           user   UniversityDetails objects get email email          if not user               print  quot No user quot              return render to response  quot forgotPassword html quot           else              newPassword   user password             send mail  Password Recovery    The password for your site is    newPassword   rv nair gmail com         rv ks gmail com    fail silently False                 return render to response  quot passwordRecovery html quot       return render to response  forgotPassword html    html  lt form name  quot forgotPassword quot  method  quot POST quot  id  quot myFormid quot  action  quot http   10 1 0 90 8080 forgotPassword  quot  gt   lt div style  quot float center width 100  color  0000A0 quot  gt   Enter your E-mail ID lt  label gt  lt br  gt   lt input type  quot text quot  name  quot email quot  size  quot 25 quot    gt     lt input type  quot submit quot  value  quot Submit quot    gt    lt  div gt     lt  form  gt

User · Answer

I also had this problem  It was caused by the development server not deleting the django session after a debug abort in Aptana  with subsequent database deletion    Meaning the id of a non-existent database record was still present in the session the next time the development server started   To resolve this during development  I used   request session flush

User · Answer

You can use this in your case  it will work fine   user   UniversityDetails objects filter email email  first

User · Answer

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

User · Answer

try      user   UniversityDetails objects get email email  except UniversityDetails DoesNotExist      user   None  I also see you re storing your passwords in plaintext  a big security no-no     Consider using the built-in auth system instead

User · Answer

In case anybody is here and the other two solutions do not make the trick  check that what you are using to filter is what you expect   user   UniversityDetails objects get email email    is email a str  or a None  or an int

User · Answer

As mentioned in Django docs  when get method finds no entry or finds multiple entries  it raises an exception  this is the expected behavior      get   raises MultipleObjectsReturned if more than one object was   found  The MultipleObjectsReturned exception is an attribute of the   model class       get   raises a DoesNotExist exception if an object wasn   t found for   the given parameters  This exception is an attribute of the model   class    Using exceptions is a way to handle this problem  but I actually don t like the ugly try-except block  An alternative solution  and cleaner to me  is to use the combination of filter   first    user   UniversityDetails objects filter email email  first     When you do  first   to an empty queryset it returns None  This way you can have the same effect in a single line    The only difference between catching the exception and using this method occurs when you have multiple entries  the former will raise an exception while the latter will set the first element  but as you are using get I may assume we won t fall on this situation   Note that first method was added on Django 1 6

[python] matching query does not exist Error in Django

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