Issue Django, in insert session login user data in database?

[Remaze Vs]

Actually I want to insert session login user data in database but I when I put this code I get all register user in Dropdown but I want to only current login user data not all and also I want to hide this field value.please help.

model.py

from django.conf import settings
from django.core.urlresolvers import reverse
from django.db import models
from django.db.models.signals import post_save
from django.contrib.auth.models import User     


class Product(models.Model):
title = models.CharField(max_length=120)
description = models.TextField(null=True, blank=True,max_length=200)
category = models.ManyToManyField(Category, null=True, blank=True)
price = models.DecimalField(decimal_places=2, max_digits=100, default=29.99)
sale_price = models.DecimalField(decimal_places=2, max_digits=100,\
                                            null=True, blank=True)
slug = models.SlugField(unique=True)
timestamp = models.DateTimeField(auto_now_add=True, auto_now=False)
updated = models.DateTimeField(auto_now_add=False, auto_now=True)
active = models.BooleanField(default=True)
update_defaults = models.BooleanField(default=False)
user = models.ForeignKey(User)



def __unicode__(self):
    return self.title

class Meta:
    unique_together = ('title', 'slug')

def get_price(self):
    return self.price

def get_absolute_url(self):
    return reverse("single_product", kwargs={"slug": self.slug})

view.py

class DealsForm(ModelForm):
class Meta:
    model = Product

    fields = ['title','description','category','price','sale_price','slug','active','update_defaults','user']

last field user where I want to Insert current session login user data..how..?