from django.db import models
from django.utils.translation import ugettext_lazy as _


class Meal(models.Model):

    class Meta:
        verbose_name_plural = _('meals')

    # Meal information
    nom = models.CharField(max_length=50, verbose_name=_('name'))
    description = models.TextField(verbose_name=_('description'))
    ingredients = models.ManyToManyField(
        'meal.Ingredient',
        related_name='related_meals'
    )

    def __str__(self):
        return self.nom


class Ingredient(models.Model):

    class Meta:
        verbose_name_plural = _('ingredients')

    # Ingredient information
    nom = models.CharField(max_length=50, verbose_name=_('name'))

    def __str__(self):
        return self.nom


class Allergy(models.Model):

    class Meta:
        verbose_name_plural = _('allergies')

    # Allergy information
    nom = models.CharField(max_length=50, verbose_name=_('name'))
    description = models.TextField(verbose_name=_('description'))
    ingredients = models.ManyToManyField(
        'meal.Ingredient',
        related_name='related_allergies'
    )
    
    def __str__(self):
        return self.nom

from django.db import models
from django.utils.translation import ugettext_lazy as _


class Meal(models.Model):

    class Meta:
        verbose_name_plural = _('meals')

    # Meal information
    nom = models.CharField(max_length=50, verbose_name=_('name'))
    description = models.TextField(verbose_name=_('description'))
    ingredients = models.ManyToManyField(
        'meal.Ingredient',
        related_name='related_meals'
    )

    def __str__(self):
        return self.nom


class Ingredient(models.Model):

    class Meta:
        verbose_name_plural = _('ingredients')

    # Ingredient information
    nom = models.CharField(max_length=50, verbose_name=_('name'))

    def __str__(self):
        return self.nom


class Allergy(models.Model):

    class Meta:
        verbose_name_plural = _('allergies')

    # Allergy information
    nom = models.CharField(max_length=50, verbose_name=_('name'))
    description = models.TextField(verbose_name=_('description'))
    ingredients = models.ManyToManyField(
        'meal.Ingredient',
        related_name='related_allergies'
    )

    def __str__(self):
        return self.nom

Fix last PEP-8 error