wagtail_bakerydemo/bakerydemo/breads/models.py

from django import forms
from django.db import models
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

from modelcluster.fields import ParentalKey, ParentalManyToManyField

from wagtail.wagtailadmin.edit_handlers import FieldPanel, StreamFieldPanel
from wagtail.wagtailcore.fields import StreamField
from wagtail.wagtailcore.models import Page

from wagtail.wagtailsearch import index
from wagtail.wagtailsnippets.models import register_snippet

from bakerydemo.base.blocks import BaseStreamBlock
from bakerydemo.base.models import BasePageFieldsMixin


@register_snippet
class Country(models.Model):
    """
    Standard Django model to store set of countries of origin.
    Exposed in the Wagtail admin via Snippets.
    """

    title = models.CharField(max_length=100)

    def __str__(self):
        return self.title

    class Meta:
        verbose_name_plural = "Countries of Origin"


@register_snippet
class BreadIngredient(models.Model):
    """
    Standard Django model used as a Snippet in the BreadPage model.
    Demonstrates ManyToMany relationship.
    """
    name = models.CharField(max_length=255)

    panels = [
        FieldPanel('name'),
    ]

    def __str__(self):
        return self.name

    class Meta:
        verbose_name_plural = 'Bread ingredients'


@register_snippet
class BreadType(models.Model):
    """
    Standard Django model used as a Snippet in the BreadPage model.
    """

    title = models.CharField(max_length=255)

    panels = [
        FieldPanel('title'),
    ]

    def __str__(self):
        return self.title

    class Meta:
        verbose_name_plural = "Bread types"


class BreadPage(BasePageFieldsMixin, Page):
    """
    Detail view for a specific bread
    """

    origin = models.ForeignKey(
        Country,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
    )
    body = StreamField(
        BaseStreamBlock(), verbose_name="Describe the bread", blank=True
    )
    bread_type = models.ForeignKey(
        'breads.BreadType',
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+'
    )
    ingredients = ParentalManyToManyField('BreadIngredient', blank=True)

    content_panels = BasePageFieldsMixin.content_panels + [
        StreamFieldPanel('body'),
        FieldPanel('origin'),
        FieldPanel('bread_type'),
        FieldPanel('ingredients', widget=forms.CheckboxSelectMultiple),
    ]

    search_fields = Page.search_fields + [
        index.SearchField('title'),
        index.SearchField('body'),
    ]

    parent_page_types = ['BreadsIndexPage']

    api_fields = ['title', 'bread_type', 'origin', 'image']


class BreadsIndexPage(BasePageFieldsMixin, Page):
    """
    Index page for breads. We don't have any fields within our model but we need
    to alter the page model's context to return the child page objects - the
    BreadPage - so that it works as an index page
    """

    subpage_types = ['BreadPage']

    def get_context(self, request):
        context = super(BreadsIndexPage, self).get_context(request)

        # Get the full unpaginated listing of resource pages as a queryset -
        # replace this with your own query as appropriate
        all_resources = self.get_children().live()

        paginator = Paginator(all_resources, 5)  # Show 5 resources per page

        page = request.GET.get('page')
        try:
            resources = paginator.page(page)
        except PageNotAnInteger:
            # If page is not an integer, deliver first page.
            resources = paginator.page(1)
        except EmptyPage:
            # If page is out of range (e.g. 9999), deliver last page of results.
            resources = paginator.page(paginator.num_pages)

        # make the variable 'resources' available on the template
        context['resources'] = resources
        context['paginator'] = paginator
        return context