Bread Pages

class BreadPage(Page):
    """
    Detail view for a specific bread
    """
    introduction = models.TextField(help_text="Text to describe the page", blank=True)
    image = models.ForeignKey(
        "wagtailimages.Image",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="+",
        help_text="Landscape mode only; horizontal width between 1000px and 3000px.",
    )
    body = StreamField(
        BaseStreamBlock(), verbose_name="Page body", blank=True, use_json_field=True
    )
    origin = models.ForeignKey(
        Country,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
    )
    bread_type = models.ForeignKey(
        "breads.BreadType",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="+",
    )
    ingredients = ParentalManyToManyField("BreadIngredient", blank=True)

class BreadsIndexPage(Page):
    """
    Index page for breads.
    
    This is more complex than other index pages on the bakery demo site as we've
    included pagination. We've separated the different aspects of the index page
    to be discrete functions to make it easier to follow
    """
    introduction = models.TextField(help_text="Text to describe the page", blank=True)
    image = models.ForeignKey(
        "wagtailimages.Image",
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="+",
        help_text="Landscape mode only; horizontal width between 1000px and 3000px.",
    )

class Country(models.Model):
    """
    A Django model to store set of countries of origin.
    It is made accessible in the Wagtail admin interface through the 
    CountrySnippetViewSet class in wagtail_hooks.py.
    """
    title = models.CharField(max_length=100)
    sort_order = models.IntegerField(null=True, blank=True, db_index=True)
    
    class Meta:
        verbose_name = "country of origin"
        verbose_name_plural = "countries of origin"

class BreadIngredient(Orderable, DraftStateMixin, RevisionMixin, models.Model):
    """
    A Django model to store a single ingredient.
    It uses DraftStateMixin and RevisionMixin to support drafts and revisions.
    """
    name = models.CharField(max_length=255)
    
    revisions = GenericRelation(
        "wagtailcore.Revision",
        content_type_field="base_content_type",
        object_id_field="object_id",
        related_query_name="bread_ingredient",
        for_concrete_model=False,
    )
    
    panels = [
        FieldPanel("name"),
    ]
    
    class Meta:
        verbose_name = "bread ingredient"
        verbose_name_plural = "bread ingredients"
        ordering = ["sort_order", "name"]

class BreadType(RevisionMixin, models.Model):
    """
    A Django model to define the bread type
    It is made accessible in the Wagtail admin interface through the 
    BreadTypeSnippetViewSet class in wagtail_hooks.py.
    """
    title = models.CharField(max_length=255)
    
    revisions = GenericRelation(
        "wagtailcore.Revision",
        content_type_field="base_content_type",
        object_id_field="object_id",
        related_query_name="bread_type",
        for_concrete_model=False,
    )
    
    panels = [
        FieldPanel("title"),
    ]
    
    class Meta:
        verbose_name = "bread type"
        verbose_name_plural = "bread types"