title: django: blog() missing 1 required positional argument: 'blog_id'
body: <p>I am attempting to add a blog to an existing test website, but I am receiving the following error message:</p>
  
  <pre><code>blog() missing 1 required positional argument: 'blog_id'
  </code></pre>
  
  <p>This may be a simple mistake I have made, but I am stumped at what I have done incorrectly and how to fix this. I have searched google and SO, but I haven't found a suitable reference.</p>
  
  <p>Here is my models class:</p>
  
  <pre><code>class Blog(models.Model):
      blog_title = models.CharField(null=False, blank=False, max_length=150, unique=True)
      blog_description = models.CharField(null=False, blank=False, max_length=500)
      blog_script = models.CharField(null=True, blank=True, max_length=5000)
      blog_date_released = models.DateField(null=False, blank=False)
      blog_tags = models.CharField(null=True, blank=True, max_length=150)
      blog_video_url = models.URLField(null=False, blank=False, max_length=250)
      blog_timestamp_added = models.DateTimeField(auto_now_add=True, auto_now=False)
      blog_timestamp_updated = models.DateTimeField(auto_now=True, auto_now_add=False)
  </code></pre>
  
  <p>Here is my views.py file:</p>
  
  <pre><code>from django.shortcuts import render
  from django.utils.translation import ugettext_lazy as _
  from myapp.core.decorators import *
  from myapp.core.models import Blog
  
  def blog(request, blog_id):
      blog = Blog.objects.get(pk=blog_id)
      ....
      return render(request, 'blog/blog.html', {
          'blog': blog,
          'display_default_language': the_display_default_language,
          'language_versions': language_versions,
          'language_versions_num_enabled': language_versions_num_enabled,
          'language_versions_num_total': language_versions_num_total,
          'var_page_title': _("Blog"),
      })
  </code></pre>
  
  <p>Here is mu urls.py file:</p>
  
  <pre><code>urlpatterns = [
      ....
      url(r'^blog/blog/$', views.blog, name='blog'),
  ]
  </code></pre>
  
  <p>Any help will be greatly appreciated.</p>