wagtail/docs/getting_started/tutorial.rst

Your first Wagtail site
=======================

.. note::
   This tutorial covers setting up a brand new Wagtail project. If you'd like to add Wagtail to an existing Django project instead, see :doc:`integrating_into_django`.

1. Install Wagtail and its dependencies::

    pip install wagtail

2. Start your site::

    wagtail start mysite
    cd mysite

   Wagtail provides a ``start`` command similar to
   ``django-admin.py startproject``. Running ``wagtail start mysite`` in
   your project will generate a new ``mysite`` folder with a few
   Wagtail-specific extras, including the required project settings, a
   "home" app with a blank ``HomePage`` model and basic templates and a sample
   "search" app.

3. Install project dependencies::

    pip install -r requirements.txt

   This ensures that you have the relevant version of Django for the project you've just created.

4. Create the database::

    python manage.py migrate

   If you haven't updated the project settings, this will be a SQLite
   database file in the project directory.

5. Create an admin user::

    python manage.py createsuperuser

6. ``python manage.py runserver`` If everything worked,
   http://127.0.0.1:8000 will show you a welcome page

   .. figure:: ../_static/images/tutorial/tutorial_1.png
      :alt: Wagtail welcome message

   You can now access the administrative area at http://127.0.0.1:8000/admin

   .. figure:: ../_static/images/tutorial/tutorial_2.png
      :alt: Administrative screen

Extend the HomePage model
-------------------------

Out of the box, the "home" app defines a blank ``HomePage`` model in ``models.py``, along with a migration that creates a homepage and configures Wagtail to use it.

Edit ``home/models.py`` as follows, to add a ``body`` field to the model:

.. code-block:: python

    from __future__ import unicode_literals

    from django.db import models

    from wagtail.wagtailcore.models import Page
    from wagtail.wagtailcore.fields import RichTextField
    from wagtail.wagtailadmin.edit_handlers import FieldPanel


    class HomePage(Page):
        body = RichTextField(blank=True)

        content_panels = Page.content_panels + [
            FieldPanel('body', classname="full")
        ]

``body`` is defined as ``RichTextField``, a special Wagtail field. You
can use any of the `Django core fields <https://docs.djangoproject.com/en/1.8/ref/models/fields/>`__. ``content_panels`` define the
capabilities and the layout of the editing interface. :doc:`More on creating Page models. <../topics/pages>`

Run ``python manage.py makemigrations``, then
``python manage.py migrate`` to update the database with your model
changes. You must run the above commands each time you make changes to
the model definition.

You can now edit the homepage within the Wagtail admin area (go to Explorer, Homepage, then Edit) to see the new body field. Enter some text into the body field, and publish the page.

The page template now needs to be updated to reflect the changes made
to the model. Wagtail uses normal Django templates to render each page
type. It automatically generates a template filename from the model name
by separating capital letters with underscores (e.g. HomePage becomes
home\_page.html). Edit
``home/templates/home/home_page.html`` to contain the following:

.. code-block:: html+django

    {% extends "base.html" %}

    {% load wagtailcore_tags %}

    {% block body_class %}template-homepage{% endblock %}

    {% block content %}
        {{ page.body|richtext }}
    {% endblock %}

.. figure:: ../_static/images/tutorial/tutorial_3.png
   :alt: Updated homepage


Wagtail template tags
~~~~~~~~~~~~~~~~~~~~~

Wagtail provides a number of :ref:`template tags & filters <template-tags-and-filters>`
which can be loaded by including ``{% load wagtailcore_tags %}`` at the top of
your template file.

In this tutorial, we use the `richtext` filter to escape and print the contents
of a ``RichTextField``:

.. code-block:: html+django

    {% load wagtailcore_tags %}
    {{ page.body|richtext }}

Produces:

.. code-block:: html

    <div class="rich-text">
        <p>
            <b>Welcome</b> to our new site!
        </p>
    </div>

**Note:** You'll need to include ``{% load wagtailcore_tags %}`` in each
template that uses Wagtail's tags. Django will throw a ``TemplateSyntaxError``
if the tags aren't loaded.


A basic blog
------------

We are now ready to create a blog. To do so, run
``python manage.py startapp blog`` to create a new app in your Wagtail site.

Add the new ``blog`` app to ``INSTALLED_APPS`` in ``mysite/settings/base.py``.

Blog Index and Posts
~~~~~~~~~~~~~~~~~~~~

Lets start with a simple index page for our blog. In ``blog/models.py``:

.. code-block:: python

    from wagtail.wagtailcore.models import Page
    from wagtail.wagtailcore.fields import RichTextField
    from wagtail.wagtailadmin.edit_handlers import FieldPanel

    class BlogIndexPage(Page):
        intro = RichTextField(blank=True)

        content_panels = Page.content_panels + [
            FieldPanel('intro', classname="full")
        ]

Run ``python manage.py makemigrations`` and ``python manage.py migrate``.

Since the model is called ``BlogIndexPage``, the default template name
(unless we override it) will be ``blog/templates/blog/blog_index_page.html:``

.. code-block:: html+django

    {% extends "base.html" %}

    {% load wagtailcore_tags %}

    {% block body_class %}template-blogindexpage{% endblock %}

    {% block content %}
        <h1>{{ page.title }}</h1>

        <div class="intro">{{ page.intro|richtext }}</div>

        {% for post in page.get_children %}
            <h2><a href="{% pageurl post %}">{{ post.title }}</a></h2>
            {{ post.specific.intro }}
            {{ post.specific.body|richtext }}
        {% endfor %}

    {% endblock %}

Most of this should be familiar, but we'll explain ``get_children`` a bit later.
Note the ``pageurl`` tag, which is similar to Django's ``url`` tag but
takes a Wagtail Page object as an argument.

In the Wagtail admin, create a ``BlogIndexPage`` under the Homepage,
make sure it has the slug "blog" on the Promote tab, and publish it.
You should now be able to access the url ``/blog`` on your site
(note how the slug from the Promote tab defines the page URL).

Now we need a model and template for our blog posts. In ``blog/models.py``:

.. code-block:: python

    from django.db import models

    from wagtail.wagtailcore.models import Page
    from wagtail.wagtailcore.fields import RichTextField
    from wagtail.wagtailadmin.edit_handlers import FieldPanel
    from wagtail.wagtailsearch import index


    # ...


    class BlogPage(Page):
        date = models.DateField("Post date")
        intro = models.CharField(max_length=250)
        body = RichTextField(blank=True)

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

        content_panels = Page.content_panels + [
            FieldPanel('date'),
            FieldPanel('intro'),
            FieldPanel('body', classname="full")
        ]

Run ``python manage.py makemigrations`` and ``python manage.py migrate``.

Create a template at ``blog/templates/blog/blog_page.html``:

.. code-block:: html+django

    {% extends "base.html" %}

    {% load wagtailcore_tags %}

    {% block body_class %}template-blogpage{% endblock %}

    {% block content %}
        <h1>{{ page.title }}</h1>
        <p class="meta">{{ page.date }}</p>

        <div class="intro">{{ page.intro }}</div>

        {{ page.body|richtext }}

        <p><a href="{{ page.get_parent.url }}">Return to blog</a></p>

    {% endblock %}

Note the use of Wagtail's built-in ``get_parent()`` method to obtain the
URL of the blog this post is a part of.

Now create a few blog posts as children of ``BlogIndexPage.``
Be sure to select type "Blog Page" when creating your posts.

.. figure:: ../_static/images/tutorial/tutorial_4a.png
   :alt: Create blog post as child of BlogIndex

.. figure:: ../_static/images/tutorial/tutorial_4b.png
  :alt: Choose type BlogPost

Wagtail gives you full control over what kinds of content can be created under
various parent content types. By default, any page type can be a child of any
other page type.

.. figure:: ../_static/images/tutorial/tutorial_5.png
   :alt: Page edit screen

You should now have the very beginnings of a working blog.
Access the ``/blog`` URL and you should see something like this:

.. figure:: ../_static/images/tutorial/tutorial_7.png
   :alt: Blog basics

Titles should link to post pages, and a link back to the blog's
homepage should appear in the footer of each post page.

Parents and Children
~~~~~~~~~~~~~~~~~~~~

Much of the work you'll be doing in Wagtail revolves around the concept of hierarchical
"tree" structures consisting of nodes and leaves (see :doc:`../reference/pages/theory`).
In this case, the ``BlogIndexPage`` is a "node" and individual ``BlogPage`` instances
are the "leaves".

Take another look at the guts of ``BlogIndexPage:``

.. code-block:: html+django

    {% for post in page.get_children %}
        <h2><a href="{% pageurl post %}">{{ post.title }}</a></h2>
        {{ post.specific.intro }}
        {{ post.specific.body|richtext }}
    {% endfor %}

Every "page" in Wagtail can call out to its parent or children
from its own position in the hierarchy. But why do we have to
specify ``post.specific.intro`` rather than ``post.intro?``
This has to do with the way we defined our model:

``class BlogPage(Page):``

The ``get_children()`` method gets us a list of instances of the ``Page`` base class.
When we want to reference properties of the instances that inherit from the base class,
Wagtail provides the ``specific`` method that retrieves the actual ``BlogPage`` record.
While the "title" field is present on the base ``Page`` model, "intro" is only present
on the ``BlogPage`` model, so we need ``.specific`` to access it.

To tighten up template code like this, we could use Django's ``with`` tag:

.. code-block:: html+django

    {% for post in page.get_children %}
        {% with post=post.specific %}
            <h2><a href="{% pageurl post %}">{{ post.title }}</a></h2>
            <p>{{ post.intro }}</p>
            {{ post.body|richtext }}
        {% endwith %}
    {% endfor %}

When you start writing more customized Wagtail code, you'll find a whole set of QuerySet
modifiers to help you navigate the hierarchy.

.. code-block:: python

    # Given a page object 'somepage':
    MyModel.objects.descendant_of(somepage)
    child_of(page) / not_child_of(somepage)
    ancestor_of(somepage) / not_ancestor_of(somepage)
    parent_of(somepage) / not_parent_of(somepage)
    sibling_of(somepage) / not_sibling_of(somepage)
    # ... and ...
    somepage.get_children()
    somepage.get_ancestors()
    somepage.get_descendants()
    somepage.get_siblings()

For more information, see: :doc:`../reference/pages/queryset_reference`

Overriding Context
~~~~~~~~~~~~~~~~~~

There are a couple of problems with our blog index view:

1) Blogs generally display content in *reverse* chronological order
2) We want to make sure we're only displaying *published* content.

To accomplish these things, we need to do more than just grab the index
page's children in the template. Instead, we'll want to modify the
QuerySet in the model definition. Wagtail makes this possible via
the overridable ``get_context()`` method. Modify your ``BlogIndexPage``
model like this:

.. code-block:: python

    class BlogIndexPage(Page):
        intro = RichTextField(blank=True)

        def get_context(self, request):
            # Update context to include only published posts, ordered by reverse-chron
            context = super(BlogIndexPage, self).get_context(request)
            blogpages = self.get_children().live().order_by('-first_published_at')
            context['blogpages'] = blogpages
            return context

All we've done here is retrieve the original context, create a custom queryset,
add it to the retrieved context, and return the modified context back to the view.
You'll also need to modify your ``blog_index_page.html`` template slightly.
Change:

``{% for post in page.get_children %}`` to ``{% for post in blogpages %}``

Now try unpublishing one of your posts - it should disappear from the blog index
page. The remaining posts should now be sorted with the most recently modified
posts first.

Image support
~~~~~~~~~~~~~

Wagtail provides support for images out of the box. To add them to
your ``BlogPage`` model:

.. code-block:: python

    from django.db import models

    from wagtail.wagtailcore.models import Page
    from wagtail.wagtailcore.fields import RichTextField
    from wagtail.wagtailadmin.edit_handlers import FieldPanel
    from wagtail.wagtailimages.edit_handlers import ImageChooserPanel
    from wagtail.wagtailsearch import index


    class BlogPage(Page):
        main_image = models.ForeignKey(
            'wagtailimages.Image',
            null=True,
            blank=True,
            on_delete=models.SET_NULL,
            related_name='+'
        )
        date = models.DateField("Post date")
        intro = models.CharField(max_length=250)
        body = RichTextField(blank=True)

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

        content_panels = Page.content_panels + [
            FieldPanel('date'),
            ImageChooserPanel('main_image'),
            FieldPanel('intro'),
            FieldPanel('body'),
        ]

Run ``python manage.py makemigrations`` and ``python manage.py migrate``.

Adjust your blog page template to include the image:

.. code-block:: html+django

    {% extends "base.html" %}

    {% load wagtailcore_tags wagtailimages_tags %}

    {% block body_class %}template-blogpage{% endblock %}

    {% block content %}
        <h1>{{ page.title }}</h1>
        <p class="meta">{{ page.date }}</p>

        {% if page.main_image %}
            {% image page.main_image width-400 %}
        {% endif %}

        <div class="intro">{{ page.intro }}</div>

        {{ page.body|richtext }}
    {% endblock %}

.. figure:: ../_static/images/tutorial/tutorial_6.png
   :alt: A blog post sample

You can read more about using images in templates in the
:doc:`docs <../topics/images>`.


Tagging Posts
~~~~~~~~~~~~~

Let's say we want to let editors "tag" their posts, so that readers can, e.g.,
view all bicycle-related content together. For this, we'll need to invoke
the tagging system bundled with Wagtail, attach it to the ``BlogPage``
model and content panels, and render linked tags on the blog post template.
Of course, we'll need a working tag-specific URL view as well.

First, alter ``models.py`` once more:

.. code-block:: python

    from django.db import models

    from modelcluster.tags import ClusterTaggableManager
    from modelcluster.fields import ParentalKey
    from taggit.models import TaggedItemBase

    from wagtail.wagtailcore.models import Page
    from wagtail.wagtailcore.fields import RichTextField
    from wagtail.wagtailadmin.edit_handlers import FieldPanel, MultiFieldPanel
    from wagtail.wagtailimages.edit_handlers import ImageChooserPanel
    from wagtail.wagtailsearch import index


    class BlogPageTag(TaggedItemBase):
        content_object = ParentalKey('BlogPage', related_name='tagged_items')


    class BlogPage(Page):
        main_image = models.ForeignKey(
            'wagtailimages.Image',
            null=True,
            blank=True,
            on_delete=models.SET_NULL,
            related_name='+'
        )
        date = models.DateField("Post date")
        intro = models.CharField(max_length=250)
        body = RichTextField(blank=True)
        tags = ClusterTaggableManager(through=BlogPageTag, blank=True)

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

        content_panels = Page.content_panels + [
            MultiFieldPanel([
                FieldPanel('date'),
                FieldPanel('tags'),
            ], heading="Blog information"),
            ImageChooserPanel('main_image'),
            FieldPanel('intro'),
            FieldPanel('body'),
        ]


    class BlogIndexPage(Page):
        intro = RichTextField(blank=True)

Note the new ``modelcluster`` and ``taggit`` imports, the addition of a new
``BlogPageTag`` model, and the addition of a ``tags`` field on ``BlogPage``.
We've also taken the opportunity to use a ``MultiFieldPanel`` in ``content_panels``
to group the date and tags fields together for readability.

Edit one of your ``BlogPage`` instances, and you should now be able to tag posts:

.. figure:: ../_static/images/tutorial/tutorial_8.png
   :alt: Tagging a post

To render tags on a ``BlogPage``, add this to ``blog_page.html``:

.. code-block:: html+django

    {% if page.tags.all.count %}
        <div class="tags">
            <h3>Tags</h3>
            {% for tag in page.tags.all %}
                <a href="{% slugurl 'tags' %}?tag={{ tag }}"><button type="button">{{ tag }}</button></a>
            {% endfor %}
        </div>
    {% endif %}

Notice that we're linking to pages here with the builtin ``slugurl``
tag rather than ``pageurl``, which we used earlier. The difference is that ``slugurl`` takes a
Page slug (from the Promote tab) as an argument. ``pageurl`` is more commonly used because it
is unambiguous and avoids extra database lookups. But in the case of this loop, the Page object
isn't readily available, so we fall back on the less-preferred  ``slugurl`` tag.

Visiting a blog post with tags should now show a set of linked
buttons at the bottom - one for each tag. However, clicking a button
will get you a 404, since we haven't yet defined a "tags" view. Add to ``models.py``:

.. code-block:: python

    class BlogTagIndexPage(Page):

        def get_context(self, request):

            # Filter by tag
            tag = request.GET.get('tag')
            blogpages = BlogPage.objects.filter().filter(tags__name=tag)

            # Update template context
            context = super(BlogTagIndexPage, self).get_context(request)
            context['blogpages'] = blogpages
            return context

Note that this Page-based model defines no fields of its own.
Even without fields, subclassing ``Page`` makes it a part of the
Wagtail ecosystem, so that you can give it a title and URL in the
admin, and so that you can manipulate its contents by returning
a queryset from its ``get_context()`` method.

Migrate this in, then create a new ``BlogTagIndexPage`` in the admin.
You'll probably want to create the new page/view under Homepage,
parallel to your Blog index. Give it the slug "tags" on the Promote tab.

Access ``/tags`` and Django will tell you what you probably already knew:
you need to create a template ``blog/blog_tag_index_page.html``:

.. code-block:: html+django

    {% extends "base.html" %}
    {% load wagtailcore_tags %}

    {% block content %}

        {% if request.GET.tag|length %}
            <h4>Showing pages tagged "{{ request.GET.tag }}"</h4>
        {% endif %}

        {% for blogpage in blogpages %}

              <p>
                  <strong><a href="{% pageurl blogpage %}">{{ blogpage.title }}</a></strong><br />
                  <small>Revised: {{ blogpage.latest_revision_created_at }}</small><br />
                  {% if blogpage.author %}
                    <p>By {{ blogpage.author.profile }}</p>
                  {% endif %}
              </p>

        {% empty %}
            No pages found with that tag.
        {% endfor %}

    {% endblock %}

We're calling the built-in ``latest_revision_created_at`` field on the ``Page``
model - handy to know this is always available.

We haven't yet added an "author" field to our ``BlogPage`` model, nor do we have
a Profile model for authors  - we'll leave those as an exercise for the reader.

Clicking the tag button at the bottom of a BlogPost should now render a page
something like this:

.. figure:: ../_static/images/tutorial/tutorial_9.png
   :alt: A simple tag view


Where next
----------

-  Read the Wagtail :doc:`topics <../topics/index>` and :doc:`reference <../reference/index>` documentation
-  Learn how to implement :doc:`StreamField <../topics/streamfield>` for freeform page content
-  Browse through the :doc:`advanced topics <../advanced_topics/index>` section and read :doc:`third-party tutorials <../advanced_topics/third_party_tutorials>`