[ckan-dev] Example for API usage (e.g. member_create)

[Heinrich Widmann]

Hi Vitor,

thank you again for your help !

Ok, now I can add datasets to a group.
But still I have problems with using CKAN APIs, especially with :
- removing datasets _really_ from CKAN data base : I know, that I can 
set the state of a dataset to 'deleted',
but I want really remove it from CKAN, that it is not longer seen 
anywhere ...
- update datasets : in our current approach we use the "extras" fields 
to cover some specific meta data keys we need.
I mangaged to to create datasets (as well with the "extras"), but I 
never get an existing dataset updated, i.e. overwrite
or add further key-value pairs.

For shure there are better approaches, but I implement it as simple 
(POST or PUT) http requests.
Maybe it helps if I  send you the corresponding python code :

................
def call_ckan(paramdict,apipath,type,jsondata,text):

     print '\t|-- Calling %s at %s' % (text,apipath)

         # Use the json module to dump the dictionary to a string for 
posting.
         param_string = urllib.quote(json.dumps(paramdict))
         if ( type == 'PUT'): # PUT requests, e.g. update a data set
              request = urllib2.Request(apipath,str(jsondata))
              request.add_header('Authorization', api_key)
              response = urllib2.urlopen(request,param_string)
              return response.read()
         else: # POST request, e.g. create a dataset
              request = urllib2.Request(url=apipath,data=param_string, \
                headers={'Content-type': 'application/json', 
'Authorization': api_key, 'X-CKAN-API-Key': api_key })
              response = urllib2.urlopen(request)


     return response.read()
...............
     api_url = "http://{host}/api/rest".format(host=ip_host) ## maybe 
it's better to use api/3 ???


     dsupdate_url = "{apiurl}/package_update".format(apiurl=api_action)
     dscreate_url = "{apiurl}/package_create".format(apiurl=api_action)

     ## the "default" meta data, dataset is created with.
     dataset_dict = {
         'name': ds,
         'title': jsondata["title"],
         'notes': jsondata["notes"].replace('\t',''),
         }

     try:
          call_ckan(dataset_dict,dscreate_url,'PUT','','CREATE') ## 
create data set (only with "default" meta data)
     ..........

     try:
dsid=call_ckan(objectJSONEncoder().encode(jsondata),dsupdate_url,'PUT','','UPDATE') 
## update dataset with full set of meta data (encode as json dict.)
     .............

For shure there are a lot of bugs in my code and for shure there are 
much better implementations ...
Anyway it would be nice to have examples of simple "ready-to-run" 
implementations (in python or curl commands or ...) of API usage
at least for dummies like me and for the basic actions as package_create 
or package_delete (real remove !!).

Cheers,
Heinrich


Am 11.04.2013 18:01, schrieb Vitor Baptista:
> Hi Heinrich,
>
> 2013/4/11 Heinrich Widmann <widmann at dkrz.de <mailto:widmann at dkrz.de>>
>
>     I checked that you can use the /group name/ for "id", but only
>     the/id/ (of package or dataset) for "object" - even more confusing
>     :-) .
>
>
> Yes, indeed. I've just opened a pull request that fixes this, both for 
> member_create and member_delete in https://github.com/okfn/ckan/pull/754.
>
>     (Actually : What's the difference between a package and a dataset
>     in CKAN ?)
>
>
> They're the same. It's just because datasets used to be called 
> packages, so there're many places in the code that they're still 
> called like this.
>
>>         The "capacity" value needs to be one of "public"
>>         or "private" when adding a package to a group.
>>
>     Actually at least for create_member as well "member" works .
>
>
> There's no validation on the capacity value yet. But, for packages, as 
> far as I could see, the only recognized values are public and private.
>
> Cheers,
> Vítor Baptista.
>
>
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Heinrich Widmann              \\ Deutsches Klimarechenzentrum GmbH
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