from django.db import models

class Square(models.Model):
    root = models.IntegerField()
    square = models.PositiveIntegerField()

    def __unicode__(self):
        return "%s ** 2 == %s" % (self.root, self.square)

class Person(models.Model):
    first_name = models.CharField(max_length=20)
    last_name = models.CharField(max_length=20)

    def __unicode__(self):
        return u'%s %s' % (self.first_name, self.last_name)

class SchoolClass(models.Model):
    year = models.PositiveIntegerField()
    day = models.CharField(max_length=9, blank=True)
    last_updated = models.DateTimeField()


class Reporter(models.Model):
    first_name = models.CharField(max_length=30)
    last_name = models.CharField(max_length=30)

    def __unicode__(self):
        return u"%s %s" % (self.first_name, self.last_name)


class Article(models.Model):
    headline = models.CharField(max_length=100)
    pub_date = models.DateField()
    reporter = models.ForeignKey(Reporter)

    def __unicode__(self):
        return self.headline