Can list display in a Django ModelAdmin display attributes of ForeignKey fields

Question

I have a Person model that has a foreign key relationship to Book  which has a number of fields  but I m most concerned about author  a standard CharField    With that being said  in my PersonAdmin model  I d like to display book author using list display   class PersonAdmin admin ModelAdmin       list display     book author      I ve tried all of the obvious methods for doing so  but nothing seems to work   Any suggestions

User · Answer

According to the documentation  you can only display the   unicode   representation of a ForeignKey   http   docs djangoproject com en dev ref contrib admin  list-display  Seems odd that it doesn t support the  book  author  style format which is used everywhere else in the DB API   Turns out there s a ticket for this feature  which is marked as Won t Fix

User · Answer

AlexRobbins  answer worked for me  except that the first two lines need to be in the model  perhaps this was assumed    and should reference self   def book author self     return self book author   Then the admin part works nicely

User · Answer

Despite all the great answers above and due to me being new to Django  I was still stuck   Here s my explanation from a very newbie perspective   models py  class Author models Model       name   models CharField max length 255   class Book models Model       author   models ForeignKey Author      title   models CharField max length 255    admin py  Incorrect Way  - you think it would work by using  model  field  to reference  but it doesn t  class BookAdmin admin ModelAdmin       model   Book     list display     title    author  name      admin site register Book  BookAdmin    admin py  Correct Way   - this is how you reference a foreign key name the Django way  class BookAdmin admin ModelAdmin       model   Book     list display     title    get name          def get name self  obj           return obj author name     get name admin order field     author    Allows column order sorting     get name short description    Author Name    Renames column head       Filtering on side - for some reason  this works      list filter     title    author  name    admin site register Book  BookAdmin    For additional reference  see the Django model link here

User · Answer

Please note that adding the get author function would slow the list display in the admin  because showing each person would make a SQL query   To avoid this  you need to modify get queryset method in PersonAdmin  for example   def get queryset self  request       return super PersonAdmin self  get queryset request  select related  book        Before  73 queries in 36 02ms  67 duplicated queries in admin       After  6 queries in 10 81ms

User · Answer

There is a very easy to use package available in PyPI that handles exactly that  django-related-admin  You can also see the code in GitHub   Using this  what you want to achieve is as simple as   class PersonAdmin RelatedFieldAdmin       list display     book  author      Both links contain full details of installation and usage so I won t paste them here in case they change   Just as a side note  if you re already using something other than model Admin  e g  I was using SimpleHistoryAdmin instead   you can do this  class MyAdmin SimpleHistoryAdmin  RelatedFieldAdmin

User · Answer

You can show whatever you want in list display by using a callable  It would look like this     def book author object     return object book author  class PersonAdmin admin ModelAdmin     list display    book author

User · Answer

I just posted a snippet that makes admin ModelAdmin support      syntax   http   djangosnippets org snippets 2887   So you can do   class PersonAdmin RelatedFieldAdmin       list display     book  author      This is basically just doing the same thing described in the other answers  but it automatically takes care of  1  setting admin order field  2  setting short description and  3  modifying the queryset to avoid a database hit for each row

User · Answer

Like the rest  I went with callables too  But they have one downside  by default  you can t order on them  Fortunately  there is a solution for that   Django    1 8  def author self  obj       return obj book author author admin order field     book  author    Django  lt  1 8  def author self       return self book author author admin order field     book  author

User · Answer

This one s already accepted  but if there are any other dummies out there  like me  that didn t immediately get it from the presently accepted answer  here s a bit more detail    The model class referenced by the ForeignKey needs to have a   unicode   method within it  like here    class Category models Model       name   models CharField max length 50       def   unicode   self           return self name   That made the difference for me  and should apply to the above scenario   This works on Django 1 0 2

User · Answer

As another option  you can do look ups like   class UserAdmin admin ModelAdmin       list display          get author        def get author self  obj           return obj book author     get author short description    Author      get author admin order field    book  author

User · Answer

This one s already accepted  but if there are any other dummies out there  like me  that didn t immediately get it from the presently accepted answer  here s a bit more detail    The model class referenced by the ForeignKey needs to have a   unicode   method within it  like here    class Category models Model       name   models CharField max length 50       def   unicode   self           return self name   That made the difference for me  and should apply to the above scenario   This works on Django 1 0 2

User · Answer

You can show whatever you want in list display by using a callable  It would look like this     def book author object     return object book author  class PersonAdmin admin ModelAdmin     list display    book author

User · Answer

I prefer this   class CoolAdmin admin ModelAdmin       list display     pk    submodel  field         staticmethod     def submodel  field obj           return obj submodel field

User · Answer

If you have a lot of relation attribute fields to use in list display and do not want create a function  and it s attributes  for each one  a dirt but simple solution would be override the ModelAdmin instace   getattr   method  creating the callables on the fly   class DynamicLookupMixin object               a mixin to add dynamic callable attributes like  book  author  which     return a function that return the instance book author value              def   getattr   self  attr           if       in attr             and not attr startswith                  and not attr endswith   boolean               and not attr endswith   short description                  def dyn lookup instance                     traverse all    lookups                 return reduce lambda parent  child  getattr parent  child                                 attr split                                      instance                 get admin order field  boolean and short description             dyn lookup admin order field   attr             dyn lookup boolean   getattr self      boolean  format attr   False              dyn lookup short description   getattr                  self      short description  format attr                   attr replace           capitalize                 return dyn lookup            not dynamic lookup  default behaviour         return self   getattribute   attr      use examples       admin register models Person  class PersonAdmin admin ModelAdmin  DynamicLookupMixin       list display     book  author    book  publisher  name                        book  publisher  country          custom short description     book  publisher  country short description    Publisher Country     admin register models Product  class ProductAdmin admin ModelAdmin  DynamicLookupMixin       list display     name    category  is new          to show as boolean field     category  is new boolean   True   As gist here  Callable especial attributes like boolean and short description must be defined as ModelAdmin attributes  eg book  author verbose name    Author name  and category  is new boolean   True   The callable admin order field attribute is defined automatically   Don t forget to use the list select related attribute in your ModelAdmin to make Django avoid aditional queries

User · Answer

if you try it in Inline  you wont succeed unless   in your inline   class AddInline admin TabularInline       readonly fields     localname        model   MyModel     fields     localname      in your model  MyModel    class MyModel models Model       localization   models ForeignKey Localizations       def localname self           return self localization name

[python] Can "list_display" in a Django ModelAdmin display attributes of ForeignKey fields?

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