ckanext-relation

This CKAN extension is intended to be used in combination with the SDDI CKAN Docker container.

Overview

This extension provides an UI for creating, deleting and viewing relationships between datasets.

In this implementation which is specifically designed for the requirements of HEF, TUM.

Requirements

This extension is tested with CKAN 2.8.0. You may have problem with the deleting if you use this version. You may need to upgrade / update the delete function to purge all deleted datasets. Have a look at this: https://github.com/ckan/ckan/blob/ckan-2.8.0/ckan/controllers/package.py#L1024

Here is the correct code:

 def delete(self, id):

        if 'cancel' in request.params:
            h.redirect_to(controller='package', action='edit', id=id)

        context = {'model': model, 'session': model.Session,
                   'user': c.user, 'auth_user_obj': c.userobj}

        try:
            if request.method == 'POST':
				# Newly added block to delete the relationship if there exists
                # It only includes three types of relationship 
				for rel in ['depends_on', 'links_to', 'child_of']: 
					print('test:'+ rel)
					rel_exist = []
					try:
						rel_exist = get_action('package_relationships_list')(data_dict={'id': id, 'rel':rel})
						print('done with action')
						print(rel_exist)
						if len(rel_exist)!=0:
							print(rel, 'exists')
							for ds in rel_exist:
								data_dict={"subject": id, "object": ds['object'], "type": rel}								
								get_action('package_relationship_delete')({}, data_dict)
								print('hier ist ds:')
					except:
						pass
                ####### till here############
				get_action('package_delete')(context, {'id': id})             
				h.flash_notice(_('Dataset has been deleted.'))
				h.redirect_to(controller='package', action='search')							
            c.pkg_dict = get_action('package_show')(context, {'id': id})
            dataset_type = c.pkg_dict['type'] or 'dataset'
        except NotAuthorized:
            abort(403, _('Unauthorized to delete package %s') % '')
        except NotFound:
            abort(404, _('Dataset not found'))
        return render('package/confirm_delete.html',
                      extra_vars={'dataset_type': dataset_type})

The javascript is also directly included in the main.min.js and not in this ckanext. Here is the Javascript code used for this extension:

$(document).ready(function() {
    $(".glyphicon").click(function() {
        $(this).toggleClass("glyphicon-chevron-down").toggleClass("glyphicon-chevron-up")
    })
});

Installation

To install ckanext-relation:

Activate your CKAN virtual environment, for example::
```
. /usr/lib/ckan/default/bin/activate
```

Install the ckanext-relation Python package into your virtual environment::

pip install -e 'git+https://github.com/tum-gis/ckanext-relation-sddi.git#egg=ckanext-relation-sddi'

Add relation to the ckan.plugins setting in your CKAN config file (by default the config file is located at /etc/ckan/default/production.ini).
Restart CKAN. For example if you've deployed CKAN with Apache on Ubuntu::
```
sudo service apache2 reload
```

Config settings

None at present

Developer installation

To install ckanext-relation for development, activate your CKAN virtualenv and do::

git clone https://github.com/tum-gis/ckanext-relation-sddi.git
cd ckanext-relation
python setup.py develop

License

The ckanext-relation is available as free and open source and is licensed under the Apache License, Version 2.0.