How to generate a json of an object that comes from forms.ModelForm

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Hi, I would like to create and save an object in the database which has arguments args and kwargs . the arguments args and kwargs must obey the format JSON , I have the following: 

class ProgramarActividadForm(forms.ModelForm):

class Meta:
    model = Mymodel
    fields = '__all__'
    widgets = {
        'nombre': forms.TextInput(attrs={
            'type' : 'text',
            'placeholder' : 'Nombre de la Tare ',
            'class': 'form-control'}),

        'tarea':forms.Select(attrs = {
            'class' : 'form-control',
            }),

        'usuarios_envio':forms.Select(attrs = {
            'class' : 'form-control',
            }),

        'grupo_envio':forms.Select(attrs = {
            'class' : 'form-control',
            }),

    }

The fields usuarios_envio and grupo_envio are as follows in the models: 

usuarios_envio = models.ForeignKey('Usuarios.User')
grupo_envio = models.ForeignKey('auth.group')

In my view.py I have something like this: 

def form_valid(self, form):

    task = ObjectTask(
        name= form.cleaned_data['nombre'],
        task=form.cleaned_data['tarea'],            
        args=json.dumps(form.cleaned_data['usuarios_envio']),
        kwargs=json.dumps({form.cleaned_data['grupo_envio']})
    )
    task.save()
    return super(ProgramarActividadView,self).form_valid(form)

Saving normal variables does not cause problems but when the argument is an object, in this case for args and kwargs tells me that it can not be serialized.

Error:

  

<User: Administrator> is not JSON serializable

Update:

The first solution they propose is tested 

kwargs=json.dumps({'msjtxt': form.cleaned_data['usuarios_envio'].__dict__,})

But now you get an error:

  

PhoneNumber is not serializable JSON

because as seen: 

usuarios_envio = models.ForeignKey('Usuarios.User')

refers to a model User and that model has an attribute: 

celular_gsm = PhoneNumberField(blank=True, help_text=help_text_number)

I already tried the following solution: 

kwargs=json.dumps({'msjtxt': form.cleaned_data['usuarios_envio'].values(),})

But I get an error because User does not have the attribute Values

Then I tried the following: 

kwargs=json.dumps({'msjtxt': form.cleaned_data['usuarios_envio'].__dict__.values(),})

And he sent me the following error:

  

dict_values ([PhoneNumber (country_code = 52, national_number = 1234567890, extension = None, italian_leading_zero = None, number_of_leading_zeros = None, country_code_source = 1, preferred_domestic_carrier_code = ''), PhoneNumber (country_code = 52, national_number = 1234567890, extension = None, italian_leading_zero = None, number_of_leading_zeros = None, country_code_source = 1, preferred_domestic_carrier_code = ''), 'Centrales', '123213', '', False, 2, 'IngOM', 'maternal', 'Paterno', True, None , '[email protected]', PhoneNumber (country_code = 52, national_number = 123456789, extension = None, italian_leading_zero = None, number_of_leading_zeros = None, country_code_source = 1, preferred_domestic_carrier_code = ''), datetime.datetime (2016, 1, 7, 18, 6, 43, tzinfo =), 'Raul', '12312313', False]) is not serializable JSON

    
asked by Rocke 20.01.2016 в 14:28
source

1 answer

1

effectively, you can not directly serialize objects that derive or represent a model. to do it you must convert it to a dictionary and then serialize it. you do not indicate in which part exactly the exception happens. so I assume the following: 

def form_valid(self, form):

    task = ObjectTask(
        name= form.cleaned_data['nombre'],
        task=form.cleaned_data['tarea'],            
        args=json.dumps(form.cleaned_data['usuarios_envio'].values()),
        kwargs=json.dumps({form.cleaned_data['grupo_envio'].values()})
    )
    task.save()
    return super(ProgramarActividadView,self).form_valid(form)

edit: You can also use the "values" method to obtain the atomic values of the fields. that way if you can serialize all the fields of the object.

    
answered by 20.01.2016 в 16:17
Copy of last file in Robocopy I have this error Warning: mysqli num rows () expects parameter 1 to be mysqli result, boolean given