How can i set the size of rows , columns in textField in Django Models

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TextField is a type of field, which when used by a ModelForm by default uses the Textarea widget. Fields deal with backend storage, widgets with front-end editing.

So you need to specify the widget you want to go with your field. You want to create a ModelForm and specify the widget you want to use, per the documentation:

from django import forms

class MyForm(forms.ModelForm):
    class Meta:
        model = MyModel
        widgets = {
          'summary': forms.Textarea(attrs={'rows':4, 'cols':15}),
        }

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