title: "Cannot resolve keyword 'user' into field. Choices are: id, project_, user_"
body: <p>py like the following </p>
  
  <pre><code>class User_(models.Model):
  user_name = models.CharField(max_length=50)
  user_password = models.CharField(max_length=50)
  user_admin = models.BooleanField(False)
  
  class Project_(models.Model):
  project_name = models.CharField(max_length=20)
  users = models.ManyToManyField(User_)
  project_path = models.FilePathField()
  </code></pre>
  
  <p>and now I tried to use the many_to_many field users in the following </p>
  
  <pre><code>    usr = User_.objects.get(user_name= userName) #it retrieves the correct object
      newProject = Project_(project_name=projectName)
      newProject.save()
      newProject.users.add(usr) #here is the error 
      newProject.save()
  </code></pre>
  
  <p>The error raised is:
  "Cannot resolve keyword 'user' into field. Choices are: id, project_, user_"</p>
  
  <p>I could not fix that error, Any help?
  Thanks.</p>