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StreamField for native Django Admin or with Grappelli

Project description

Django StreamField

This is a simple realisation of StreamField's idea from Wagtail CMS

Highlights

You can build your page with different kind of blocks. Sort them and sort the lists inside the blocks.

For editing content inside the blocks, it use native popup mechanism in Django admin interface. This allow you to use other field's widgets inside the blocks as is. For example, if you want to use in your blocks FileBrowseField from django-filebrowser, it will perfectly working without any additional settings.

Module also working with Grappelli Interface (Optional)

django-streamfield demo screenshot

Contents

Installation

pip install django-streamfield

How to use

1. Create new app called streamblocks

2. Put to streamblocks/models.py some models

...that you want to use in your stream field. And add this models in STREAMBLOCKS_MODELS list. For example:

# streamblocks/models.py

# one object
class RichText(models.Model):
    text = models.TextField(blank=True, null=True)   

    class Meta:
        # This will use as name of block in admin
        verbose_name="Text"

# list of objects
class ImageWithText(models.Model):
    image = models.ImageField(upload_to="folder/")
    text = models.TextField(null=True, blank=True)
    
    # StreamField option for list of objects
    as_list = True

    class Meta:
        verbose_name="Images with text"

# Register blocks for StreamField as list of models
STREAMBLOCKS_MODELS = [
    RichText,
    ImageWithText
]

3. Create templates for each models above, named as lowercase names of the models:

  1. streamblocks/templates/streamblocks/richtext.html
  2. streamblocks/templates/streamblocks/imagewithtext.html

And use block_content as context.

Note: block_content will be single object if no 'as_list' property in your model, and will be a list of objects if there is.

<!--richtext.html-->
<div class="rich-text-block">
    {{ block_content.text|safe }}
</div>
<!--imagewithtext.html-->
<ul class="image-with-text-block">
    {% for block in block_content %}
    <li>
        <img src="{{ block.image.url }}" alt="">
        <p>{{ block.text }}</p>
    </li>
    {% endfor %}
</ul>

4. Add apps to settings.py

Add to INSTALLED_APPS

INSTALLED_APPS = [
    ...
    'streamblocks',
    'streamfield',
    ...

5. Add streamfield.urls to main urls.py

urlpatterns += [
    path('streamfield/', include('streamfield.urls'))
]

6. Add StreamField to your model in your application

And add the models that you want to use in this stream as model_list

# models.py
from streamfield.fields import StreamField
from streamblocks.models import RichText, ImageWithText

class Page(models.Model):
    stream = StreamField(
        model_list=[ 
            RichText,
            ImageWithText
        ],
        verbose_name="Page blocks"
        )

Then if you have your 'page' in context, you can get content by field cached property page.stream.render

...
<div class="content">
    {{ page.stream.render }}
</div>
...

Admin

Custom admin class for block's models

Models will automaticaly register in admin. If you want provide custom admin class, first unregister models and register again, using StreamBlocksAdmin class.

# streamblocks/admin.py

from django.contrib import admin
from streamfield.admin import StreamBlocksAdmin

from streamblocks.models import RichText

admin.site.unregister(RichText)
@admin.register(RichText)
class RichTextBlockAdmin(StreamBlocksAdmin, admin.ModelAdmin):
    pass

Custom templates for render block models in admin

If you need to customize admin templates for block models wich you are using, you need to put templates named as described in section 3 (above). but put it inside "admin" folder.

For example for RichText block it will be:

streamblocks/templates/streamblocks/admin/richtext.html

As context use "form":

{{ form.text.value }}

Override fields rendering in admin

Name custom templates for fields as lowercased field widget name, and put it inside ...admin/fiedls/ folder.

For example for TextField widget (Textarea) of RichText block, it will be: streamblocks/templates/streamblocks/admin/fields/textarea.html

As context use "field":

{{ field.value|default:""|safe }}

Override list of blocks for your StreamField in admin.py

Typicaly you set the blocks in your models as model_list attribute of StreamField field. But if you want to change blocks, for example depending on object, you can do it in admin site of your model. Suppose you want to use only RichText on page with id=1.

# admin.py
from streamfield.fields import StreamFieldWidget
from streamblocks.models import RichText
from .models import Page

class PageAdmin(models.Admin):

    def get_form(self, request, obj=None, **kwargs):
        form = super().get_form(request, obj, **kwargs)
        if obj and obj.id == 1:
            form.base_fields['stream'].widget = StreamFieldWidget(attrs={
                'model_list': [ RichText ]
                })
        return form

Be careful with already existing blocks in db. If you remove them from admin, it produce error.

Special cases

Complex Blocks

You may use StreamField as part of blocks and create with that way complex structure and use {{ block_content.<field_name>.render }}

Blocks without data in database. Only templates.

You may use it for widgets or separators or for whatever you want... Just make the block model abstract.

class EmptyBlock(models.Model):
    class Meta:
        abstract = True
        verbose_name='Empty space'

and use streamblocks/templates/streamblocks/emptyblock.html for your content.

Note: Don't forget to register a block in STREAMBLOCKS_MODELS

Cache for reduce the number of database requests

There is two ways of caching:

  • Simple cache view with django cache
  • Create additional field, for example: 'stream_rendered' and render to this field html in save method
def save(self, *args, **kwargs):
    self.stream_rendered = self.stream.render
    super().save(*args, **kwargs)

...and use this field in your html

Settings

# settings.py

STREAMFIELD_STREAMBLOCKS_APP_PATH

If your app streamblocks located not in project root directory, you need to reflect it in settings.py

STREAMFIELD_STREAMBLOCKS_APP_PATH = 'yourapps.streamblocks'

STREAMFIELD_BLOCK_OPTIONS

You may use STREAMFIELD_BLOCK_OPTIONS in settings.py to add some options to block.

For example:

STREAMFIELD_BLOCK_OPTIONS = {
    "margins": {
        "label": "Margins",
        "type": "checkbox",
        "default": True
    }
}

In template use {{ options.margins }}

Note: Now only type "checkbox" is working, the other options in plan.

Project details


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