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from django.db import models
from django.utils import timezone

# Create your models here.
class Member(models.Model):
	__tablename__ = 'member'
	#Columns for the table user
	street = models.CharField(max_length=80)
	plz = models.CharField(max_length=40)
	city = models.CharField(max_length=150)
	selfdescription = models.TextField()
	verified = BooleanField()
	created = models.DateTimeField(auto_now_add=True)
	deleted = models.DateTimeField()
	countries = models.ForeignKey('countries')

class Messages(models.Model):
	__tablename__ = 'messages'
	timestamp = models.DateTimeField(auto_now_add=True)
	receiver = models.ForeignKey('auth.User')
	sender = models.ForeignKey('auth.User')
	read = BooleanField()
	subject = models.CharField(max_length=150)
	textbody = models.TextField()

class Countries(models.Model):
	__tablename__ = 'countries'
	iso_code = models.CharField(max_length=3)
	name = models.CharField(max_length=100)

class Remote_Source_Members(models.Model):
	__tablename__ = 'remote_source_members'
	remote_source_id = models.CharField(max_length=200)
	remote_source = models.CharField(max_length=100)
	our_member_id = models.ForeignKey('auth.User')

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python manage.py makemigrations portal
SystemCheckError: System check identified some issues:

ERRORS:
portal.Member.countries: (fields.E300) Field defines a relation with model 'countries', which is either not installed, or is abstract.
portal.Messages.receiver: (fields.E304) Reverse accessor for 'Messages.receiver' clashes with reverse accessor for 'Messages.sender'.
	HINT: Add or change a related_name argument to the definition for 'Messages.receiver' or 'Messages.sender'.
portal.Messages.sender: (fields.E304) Reverse accessor for 'Messages.sender' clashes with reverse accessor for 'Messages.receiver'.
	HINT: Add or change a related_name argument to the definition for 'Messages.sender' or 'Messages.receiver'.