Does Python have a toString equivalent and can I convert a db Model element to String

Question

I m writing a ToDo list app to help myself get started with Python  The app is running on GAE and I m storing todo items in the Data Store  I want to display everyone s items to them  and them alone  The problem is that the app currently displays all items to all users  so I can see what you write  and you see what I write  I thought casting my todo author object to a string and seeing if it matches the user s name would be a good start  but I can t figure out how to do that    This is what I have in my main py       user   users get current user    if user      nickname   user nickname       todos   Todo all       template values     nickname  nickname   todos  todos       def post self        todo   Todo       todo author   users get current user       todo item   self request get  item       todo completed   False      todo put             self redirect        In my index html I had this originally     lt input type  text  name  item  class  form-prop  placeholder  What needs to be done   required  gt        lt ul gt     for todo in todos       lt input type  checkbox  gt    todo item    lt hr   gt     endfor     lt  ul gt    but I d like to display items only to the user who created them  I thought of trying      for todo in todos           ifequal todo author nickname       lt input type  checkbox  gt    todo item    lt hr   gt         endifequal       endfor      to no avail  The list turns up blank  I assumed it is because todo author is not a string  Can I read the value out as a string  or can I cast the object to String   Thanks   Edit  Here is my Todo class  class Todo db Model   author   db UserProperty   item   db StringProperty   completed   db BooleanProperty   date   db DateTimeProperty auto now add True    Will changing my author to a StringProperty effect anything negatively  Maybe I can forgo casting altogether

User · Accepted Answer

In python  the str   method is similar to the toString   method in other languages  It is called passing the object to convert to a string as a parameter  Internally it calls the   str     method of the parameter object to get its string representation   In this case  however  you are comparing a UserProperty author from the database  which is of type users User with the nickname string  You will want to compare the nickname property of the author instead with todo author nickname in your template

User · Answer

You should define the   unicode   method on your model  and the template will call it automatically when you reference the instance

User · Answer

In Python we can use the   str     method   We can override it in our class like this    class User        firstName          lastName                   def   str   self           return self firstName         self lastName   and when running  print user    it will call the function   str   self   and print the firstName and lastName

User · Answer

In function post     todo author   users get current user     So  to get str todo author   you need str users get current user     What is returned by get current user   function    If it is an object  check does it contain a str    function   I think the error lies there

User · Answer

str   is the equivalent    However you should be filtering your query  At the moment your query is all   Todo s   todos   Todo all   filter  author      users get current user   nickname       or  todos   Todo all   filter  author      users get current user      depending on what you are defining author as in the Todo model  A StringProperty or UserProperty   Note nickname is a method   You are passing the method and not the result in template values

[python] Does Python have a toString() equivalent, and can I convert a db.Model element to String?

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