Django set default form values

Question

I have a Model as follows   class TankJournal models Model       user   models ForeignKey User      tank   models ForeignKey TankProfile      ts   models IntegerField max length 15      title   models CharField max length 50      body   models TextField     I also have a model form for the above model as follows   class JournalForm ModelForm       tank   forms IntegerField widget forms HiddenInput          class Meta          model   TankJournal         exclude     user   ts     I want to know how to set the default value for that tank hidden field  Here is my function to show save the form so far   def addJournal request  id 0       if not request user is authenticated            return HttpResponseRedirect             checking if they own the tank     from django contrib auth models import User     user   User objects get pk request session  id         if request method     POST           form   JournalForm request POST          if form is valid                obj   form save commit False                 setting the user and ts             from time import time             obj ts   int time                obj user   user              obj tank   TankProfile objects get pk form cleaned data  tank id                   saving the test             obj save        else          form   JournalForm        try          tank   TankProfile objects get user user  id id      except TankProfile DoesNotExist          return HttpResponseRedirect   error

User · Answer

As explained in Django docs  initial is not default     The initial value of a field is intended to be displayed in an HTML   But if the user delete this value  and finally send back a blank value for this field  the initial value is lost  So you do not obtain what is expected by a default behaviour  The default behaviour is   the value that validation process will take if data argument do not contain any value for the field    To implement that  a straightforward way is to combine initial and clean  lt field gt      class JournalForm ModelForm       tank   forms IntegerField widget forms HiddenInput    initial 123                   def clean tank self           if not self  tank   html name in self data              return self fields  tank   initial         return self cleaned data  tank

User · Answer

If you are creating modelform from POST values initial can be assigned this way   form   SomeModelForm request POST  initial   option    10      https   docs djangoproject com en 1 10 topics forms modelforms  providing-initial-values

User · Answer

Other solution  Set initial after creating the form   form fields  tank   initial   123

User · Answer

You can use initial which is explained here  You have two options either populate the value when calling form constructor   form   JournalForm initial   tank   123     or set the value in the form definition   tank   forms IntegerField widget forms HiddenInput    initial 123

User · Answer

I hope this can help you   form instance updatedby   form cleaned data  updatedby     request user id

User · Answer

I had this other solution  I m posting it in case someone else as me is using the following method from the model    class onlyUserIsActiveField forms ModelForm       def   init   self   args    kwargs           super onlyUserIsActiveField  self    init    args    kwargs          self fields  is active   initial   False      class Meta          model   User         fields     is active           labels     is active    Is Active           widgets                  is active   forms CheckboxInput  attrs                                class             form-control bootstrap-switch                                data-size         mini                                data-on-color     success                                data-on-text      Active                                data-off-color    danger                                data-off-text     Inactive                                name              is active                               The initial is definded on the   init   function as self fields  is active   initial   False

[python] Django set default form values

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