Man this solved my problem, I can't believe that is spend few hours not 
seeing this....
But now that I am able to create products with my current user, i have 
another problem:

When I login with admin while I am logged in with my current user, and then 
create product,
product is being added as by admin not as by current user as it should be.
otherwise when I am not logged in with admin(but only with current user) 
everything seems to work fine.
Can you help me maybe with this one?
Thanks.
On Thursday, May 25, 2017 at 11:19:11 PM UTC+2, Vijay Khemlani wrote:
>
> "form.instance.user" 
>
> should be 
>
> "form.instance.seller" 
>
> But the "null value in column" error could also apply to any of the 
> non-nullable fields in your Product model that are not set by the time 
> you save the instance. 
>
> On 5/25/17, Ismail Sarenkapic <[email protected] <javascript:>> wrote: 
> > Tnx. 
> > The slug is not important here. 
> > The main question is how do I add product  with current user! 
> > 
> > On Thursday, May 25, 2017 at 8:00:08 PM UTC+2, Muhammad wrote: 
> >> 
> >> Ismail, 
> >> 
> >> You don't seem to be handling the value for Product.slug anywhere, 
> either 
> >> 
> >> in the model or the view. 
> >> 
> >> You can fix the slug issue by overriding the Product model's save () 
> >> method like this: 
> >> 
> >> def save (self, *args, **kwargs): 
> >>      if not self.slug: 
> >>         self.slug = slugify(self.title) 
> >>     super(Product, self).save (*args, **kwargs) 
> >> 
> >> This way, you can automatically generate the value of the slug field 
> when 
> >> 
> >> a valid form is submitted. 
> >> 
> >> If you are still having problems, please, do let us know. 
> >> 
> >> All the best. 
> >> 
> >> Sincerely, 
> >> Muhammad 
> >> 
> >> On May 25, 2017 7:20 AM, "Ismail Sarenkapic" <[email protected] 
> >> <javascript:>> wrote: 
> >> 
> >> Hi, I'm trying to create a digital marketplace site where users will be 
> >> able to register and submit their products. 
> >> I created the Product model and connected it with User with foreign 
> >> key.Everything seems  to be alright, but when I submit my product i get 
> >> the 
> >> following error: 
> >> 
> >> null value in column violates not-null constraint 
> >>  it looks like relation between product and user is not properly 
> >> configured(regardless of my mixin that is suppose to handle it) 
> >> 
> >> 
> __________________________________________________________________________________________________________________________________
>  
>
> >> note that I'm using: 
> >> 
> >> database:postgresql 
> >> 
> >> allauth(for user registration) 
> >> 
> >> 
> __________________________________________________________________________________________________________________________________
>  
>
> >> 
> >> ________ 
> >> models.py 
> >> 
> >> from django.conf import settings 
> >> from django.db import models 
> >> from django.db.models.signals import pre_save, post_save 
> >> from django.core.urlresolvers import reverse 
> >> from django.utils.text import slugify 
> >> # Create your models here. 
> >> 
> >> 
> >> 
> >> class Product(models.Model): 
> >>    seller = models.ForeignKey(settings.AUTH_USER_MODEL) 
> >>    #user = models.OneToOneField(settings.AUTH_USER_MODEL) 
> >>    # user = models.ForeignKey(settings.AUTH_USER_MODEL) 
> >>    # managers = models.ManyToManyField(settings.AUTH_USER_MODEL, 
> >> related_name="managers_products", blank=True) 
> >>    title = models.CharField(max_length=30) 
> >> #owiuerpoajsdlfkjasd;flkiu1p3o4u134123 ewjfa;sd 
> >>    slug = models.SlugField(blank=True, unique=True) 
> >>    description = models.TextField() 
> >>    price = models.DecimalField(max_digits=100, decimal_places=2, 
> >> default=9.99, null=True,) #100.00 
> >> 
> >> 
> >>    def __unicode__(self): #def __unicode__(self): 
> >>       return self.title 
> >> 
> >> _______ 
> >> views.py 
> >> 
> >> 
> >> from django.views import View 
> >> from django.views.generic import ( 
> >>                 CreateView, 
> >>                 ) 
> >> 
> >> from .forms import ProductModelForm 
> >> from .mixins import FormUserNeededMixin 
> >> # Create your views here. 
> >> 
> >> 
> >> class ProductCreateView(FormUserNeededMixin, CreateView): 
> >>     form_class = ProductModelForm 
> >>     template_name = 'create_view.html' 
> >> 
> >> _______ 
> >> forms.py 
> >> 
> >> from django import forms 
> >> 
> >> from django.utils.text import slugify 
> >> 
> >> from .models import Product 
> >> 
> >> 
> >> class ProductModelForm(forms.ModelForm): 
> >>    class Meta: 
> >>       model = Product 
> >>       fields = [ 
> >>          "title", 
> >>          "description", 
> >>          "price", 
> >>       ] 
> >> 
> >> ________ 
> >> mixins.py 
> >> 
> >> from django import forms 
> >> from django.forms.utils import ErrorList 
> >> 
> >> class FormUserNeededMixin(object): 
> >> 
> >>      def form_valid(self, form): 
> >>         if self.request.user.is_authenticated(): 
> >>             form.instance.user = self.request.user 
> >>             return super(FormUserNeededMixin, self).form_valid(form) 
> >>         else: 
> >>             form._errors[forms.forms.NON_FIELD_ERRORS] = 
> ErrorList(["User 
> >> must be logged in to continue."]) 
> >>             return self.form_invalid(form) 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> -- 
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> >> 
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> >> 
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>  
> >> 
> >> <
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