[ckan-dev] Schema "tree-like" update

[Ian Ward]

On Thu, Dec 18, 2014 at 8:51 AM, Funquist Tomas <tomas.funquist at smhi.se> wrote:
> Hello!

Hello Tomas,

Yes it is possible, but you have to handle making your tree-like
objects flat for storing in the DB and you need to accept a flat
representation if you want to be able to update them from the dataset
editing form.

>
> Is it in a plugin possible to update the schema to have “tree-like”
> structure like eg:
[...]
>
>         “accessconstraint": [
>
>                "Pending Patent",
>
>               "Trademark"
>
>         ],

ckanext-repeating[1] has validators[2] you can use for lists of strings.

[1]: https://github.com/open-data/ckanext-repeating
[2]: https://github.com/open-data/ckanext-repeating/blob/master/ckanext/repeating/validators.py

[...]
>
>         "geographics": {
>
>              "north":  “90”,
>
>             "south":  “90”,
>
>             "west":  “90”,
>
>             "east":  “90”
>
>         },

ckanext-fluent[3] uses dicts for different language versions, so you
could write something similar to its validators[4] for your schema.

[3]: https://github.com/open-data/ckanext-fluent/
[4]: https://github.com/open-data/ckanext-fluent/blob/master/ckanext/fluent/validators.py

[...]
>         "contact": {
>
>              "name": “Arne Weise”,
>
>             "orgname": “SVT”,
>
>             "role": "author",
>
>             "email": [
>
>                “a at b.se",
>
>                "c at d.se"
>
>             ]

Again, you would need a pair of custom validators for more interesting
nested objects like this, but it can be done.

There is also someone working on a more advanced way of specifying
metadata schemas based on zope schemas. When that's released as a
separate extension that might be a really good fit for what you want.

Ian