ckanext-gallery

A CKAN extension for a dataset gallery view.

Overview

Adds a gallery view for resources on a CKAN instance. Two plugins are included in this extension: gallery and gallery_image.

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

1. Clone the repository into the src folder:

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

1. Activate the virtual env:

. $INSTALL_FOLDER/bin/activate

1. Install the requirements from requirements.txt:

cd $INSTALL_FOLDER/src/ckanext-gallery
pip install -r requirements.txt

1. Run setup.py:

cd $INSTALL_FOLDER/src/ckanext-gallery
python setup.py develop

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

ckan.plugins = ... gallery

Configuration

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

Usage

To use as a view, the ‘Gallery’ type should be available 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

Test coverage is currently extremely limited.

To run the tests in this extension, there is a Docker compose configuration available in this repository to make it easy.

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

1. Build the required images

docker-compose build

1. 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

The ckan image uses the Dockerfile in the docker/ folder which is based on openknowledge/ckan-dev:2.9.