wagtail-filepreviews

Extend Wagtail's Documents with image previews and metadata from FilePreviews.io

Installing

Install with pip:

$ pip install wagtaildocs_previews

Settings

In your settings file, add wagtaildocs_previews to INSTALLED_APPS:

INSTALLED_APPS = [
    # ...
    'wagtaildocs_previews',
    # ...
]

You'll also need to set WAGTAILDOCS_DOCUMENT_MODEL.

WAGTAILDOCS_DOCUMENT_MODEL = 'wagtaildocs_previews.PreviewableDocument'

URL configuration

from wagtaildocs_previews import urls as wagtaildocs_urls

urlpatterns = [
    # ...
    url(r'^documents/', include(wagtaildocs_urls)),
    # ...
]

FilePreviews.io API Keys

For previews to be generated for your documents, you'll need to have a FilePreviews.io account and an application's credentials. Once you have the credentials, add them under the FilePreviews settings in your Wagtail admin.

Usage

Since we're extending via WAGTAILDOCS_DOCUMENT_MODEL you should be using get_document_model() to reference the correct Document model.

from wagtail.core.models import Page
from wagtail.documents.models import get_document_model
from wagtail.documents.edit_handlers import DocumentChooserPanel


class BookPage(Page):
    book_file = models.ForeignKey(
        get_document_model(),
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name='+'
    )

    content_panels = Page.content_panels + [
        DocumentChooserPanel('book_file'),
    ]

In your template now you'll be able to access the preview_data field.

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

{% block body_class %}resource-page{% endblock %}

{% block content %}
    <h1>Book</h>
    <h2>{{ page.book_file.title }}</h2>
    <img src="{{ page.book_file.preview_data.preview.url|default:'http://placehold.it/300x300' }}" alt="">
{% endblock %}

Configuring thumbnail sizes and other options

By default, image previews and not resized at all. If you want to specify additional FilePreviews options like thumbnail size or metadata, specify the WAGTAILDOCS_PREVIEWS_OPTIONS_CALLBACK option in your settings.

WAGTAILDOCS_PREVIEWS_OPTIONS_CALLBACK='mysite.utils.get_preview_options'

In the mysite.utils module, create a get_preview_options method.

def get_preview_options(document):
    return {
        'sizes': [300],
        'metadata': ['ocr']
    }

Bonus: Coding video session

Here’s a coding session video building up to the released package.