auto select current user in Django admin site

blog.py

# models.py
 
from django.db import models
 
class Blog(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL)
    title = models.CharField(max_length=255)
    content = models.TextField()
    
# forms.py
 
from django.forms import ModelForm
 
class BlogForm(ModelForm):
    class Meta:
        model = Blog
 
        
# admin.py
 
from django.contrib import admin
 
class BlogAdmin(admin.ModelAdmin):
 
    def get_form(self, request, obj=None, **kwargs):
        form = super(BlogAdmin, self).get_form(request, obj, **kwargs)
        form.base_fields['user'].initial = request.user
        return form
 
admin.site.register(Blog, BlogAdmin)

If you're using Django 2.2 you need to pass a second parameter to Foreign Key
user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)