Multiple download urls

[dread]

See also: PackageResources which defines a 'distribution' as a package's payload (perhaps with metadata). In our case, at least within CKAN, the representation of the distribution will just be the reference to get it (plus some minor metadata).

As a

User (package editor and package user)

I want to

(package editor) Associate multiple distributions with a package.

(package user) Easily have access to multiple distributions of a package should they exist.

Implementation

There is an object called 'Distribution' with the following attributes:

• url (text) (required in UI, but not in db table)
• format (text)
• description (text)
• package (association) - a distribution is always associated with 1 package

A package's list of distributions will have an order which is preserved. The first in the list will be known as the 'default distribution'.

How to replace download url

download_url removed and replaced as a proxy attribute. Read returns the url of the default distribution. Write changes the url of the default distribution. Ensures backward compatibility.

REST API has new attribute in package dictionary 'distributions' - an ordered list.

In WUI, replace download url in package read with a table of the distributions.

In the WUI package edit, be able to add/remove/edit/reorder distributions.

Example

Example part of package:

Distributions:

http://some.com/pollution.pdf	PDF	Original report
http://some.com/pollution.csv	csv	Original data
http://some.com/pollution	sparql	Linked version of data

Existing data to be migrated to new structure.

Cost: 4 days