ckanext-gallery

A CKAN extension for a dataset gallery view.

Overview

Adds a gallery view for resources on a CKAN instance. Three plugins are included in this extension: the main plugin (gallery) and two view plugins for specific image/data types (gallery_image and gallery_iiif).

Based on blueimp Gallery.

Installation

Path variables used below:

• $INSTALL_FOLDER (i.e. where CKAN is installed), e.g. /usr/lib/ckan/default
• $CONFIG_FILE, e.g. /etc/ckan/default/development.ini

Installing from PyPI

pip install ckanext-gallery

Installing from source

1. Clone the repository into the src folder:

   cd $INSTALL_FOLDER/src
   git clone https://github.com/NaturalHistoryMuseum/ckanext-gallery.git

2. Activate the virtual env:

   . $INSTALL_FOLDER/bin/activate

3. Install via pip:

   pip install $INSTALL_FOLDER/src/ckanext-gallery

Installing in editable mode

Installing from a pyproject.toml in editable mode (i.e. pip install -e) requires setuptools>=64; however, CKAN 2.9 requires setuptools==44.1.0. See our CKAN fork for a version of v2.9 that uses an updated setuptools if this functionality is something you need.

Post-install setup

1. Add 'gallery' to the list of plugins in your $CONFIG_FILE:

   ckan.plugins = ... gallery

2. Install lessc globally:

   npm install -g "less@~4.1"

Configuration

There's only one option that can be specified in the .ini file:

Name	Description	Default
ckanext.gallery.records_per_page	Number of images to display on a page	32

Usage

To use as a view, no further setup is needed; the 'Gallery' type should be available for resources after installing the plugin.

Interfaces

The IGalleryImage interface allows plugins to override settings.

from ckan.plugins import SingletonPlugin, implements
from ckanext.gallery.plugins.interfaces import IGalleryImage

class YourPlugin(SingletonPlugin):
  implements(IGalleryImage)


  def image_info(self):
    '''
    Return info for this plugin. If resource type is set,
    only datasets of that type will be available.
    '''
    return {u'title': u'Text',
            u'resource_type': [u'csv', u'tsv'],
            u'field_type': [u'text']}


  def get_images(self, field_value, record, data_dict):
    '''
    Process images from a single record to return custom metadata.
    The field_value depends on the image field you choose.
    '''
    images = [{
      u'href': field_value[u'url'],
      u'thumbnail': field_value[u'url'].replace(u'preview', u'thumbnail'),
      u'record_id': record[u'_id']
    } for img in field_value]
    return image

Templates

Gallery block snippet

{% snippet 'gallery/snippets/gallery.html', images=g.images, resource_id=res.id %}

Testing

There is a Docker compose configuration available in this repository to make it easier to run tests. The ckan image uses the Dockerfile in the docker/ folder.

To run the tests against ckan 2.9.x on Python3:

1. Build the required images:

   docker compose build

2. Then run the tests. The root of the repository is mounted into the ckan container as a volume by the Docker compose configuration, so you should only need to rebuild the ckan image if you change the extension's dependencies.

   docker compose run ckan