django admin 1.11 ajouter un attribut aux options d'une sélection

Question

Dans django 1.11 admin, j'ai un champ de liste et je voudrais ajouter un attribut dans chaque <option> de mon <select>

Actuellement je

<select name = "example" id = "id_example"> 
    <option value = "" selected> --------- </ option> 
    <option value = "480"> data1 </ option> 
    <option value = "481"> data2 </ option> 
    <option value = "482"> data3 </ option> 
</select> 

Je voudrais ajouter un attribut de lien vers:

<select name = "example" id = "id_example"> 
    <option value = "" selected> --------- </ option> 
    <option value = "480" link = "1"> data1 </ option> 
    <option value = "481" link = "1"> data2 </ option> 
    <option value = "482" link = "2"> data3 </ option> 
</select> 

J'ai testé la pile suivante Django form field choices, adding an attribute mais la fonction render_option (auto, se lected_choices, option_value, option_label) n'est pas django 1,11 https://code.djangoproject.com/ticket/28308

# model.py 

class ModelA(models.Model): 
    id = models.AutoField(primary_key=True) 
    fielda = models.ForeignKey('ModelB', blank=True, null=True,) 


class ModelB(models.Model): 
    id = models.AutoField(primary_key=True) # In select option is value 
    name = models.CharField(max_length=254) # In select option is data 
    link = models.Integer() # I would like a new attribute in select option link 

    def __str__(self): 
     return self.name 


# admin.py 

class ModelAInlinesForm(forms.ModelForm): 
    fielda = forms.ModelChoiceField(
     queryset=ModelB.objects.all(), 
     widget=forms.Select(attrs={'test': 'test1'})) 
    class Meta: 
     model = ModelA 
     fields = "__all__" 


class ModelAInlines(admin.TabularInline): 
    model = ModelA 
    extra = 0 
    form = ModelAInlinesForm 

Avez-vous une idée d'ajouter un attribut correctement?

Answer 1

Je me suis inspiré par https://djangosnippets.org/snippets/2453/

class ModelAInlinesFormSelect(forms.Select): 

    def create_option(self, name, value, label, selected, index, subindex=None, attrs=None): 

     option_dict = super(SemisInlinesFormSelect, self).create_option(name, value, label, selected, index, 
                    subindex=subindex, attrs=attrs) 
     if option_dict['value']: 
      option_dict['attrs']['link'] = ModelB.objects.values().get(
       id=option_dict['value'])['link_id'] 
     return option_dict 


class ModelAInlinesForm(forms.ModelForm): 
    fielda = forms.ModelChoiceField(
     queryset=ModelB.objects.all(), 
     widget=ModelAInlinesFormSelect())