[aerogear-dev] aerogear-js CouchDB data-manager adapter

[Lucas Holmquist]

Cool Stuff,  i will take a look

On May 26, 2014, at 7:55 AM, Lukáš Fryč <lukas.fryc at gmail.com> wrote:

> Hey Tolis,
> 
> great job with the adapter!
> 
> 
> a) remove()
> 
> since there are obviously many ways how to achieve "delete all docs",
> I believe it's up to user to choose the way he wants the docs deleted
> i.e. it could be up to Data Manager configuration whether data will be deleted with or without a history loss (aka wipe out). wdyt?
> 
> 
> b) Filtering
> 
> It would be pretty overwhelming for a user to create a view per particular use of the filter() method, since it can have pretty arbitrary form.
> We are also able to create temporary views, but that requires you to perform one additional POST request and it is costly.
> 
> Are we able to come up with a common view definition that would cover all the filtering capabilities - i.e. generic aerogear-filter view?
> Something that user would define once and all cases would be covered.
> I have not practically played with CouchDB, but according the docs it could be somehow possible.
> 
> 
> 
> Btw as I think about it, there might be lack of function for limiting what data to transfer. 
> i.e. Filtering API allows you to select just particular docs, but it does not help you to avoid what will be transferred.
> 
> All the Data Managers so far are local ones, CouchDB is a first one that actually transfers data from the wire.

This is a concern i had when created the JIRA,   This “adapter” might be more appropriate for DataSync( or whatever we are calling it ).  I know we were looking at couchDB as a possible backend.

I’m wondering if we should hold off for now,  and just keep DataManager client side storage only for the moment.  I think the fallback functionality will be non-trivial  


> 
> 
> Cheers,
> 
> ~ Lukas
> 
> 
> On Mon, May 26, 2014 at 8:40 AM, tolis emmanouilidis <tolisemm at gmail.com> wrote:
> Hi,
> 
> I have started working on creating a CouchDB data-manager adapter which uses the CouchDB REST API. The open-create database, read and save operations are implemented [1] and tested both with encryption settings and without encryption settings. If you'd like to give it a try, make sure that you have enabled CORS on CouchDB side.
> 
> The remaining functions that needs to be implemented are remove and filter. In addition, in order to keep consistent the data-manager API, we should provide a way to remove all the documents in a CouchDB database-store.
> 
> a) Removing all documents in a CouchDB database
> 
> I'm thinking of fetching all the docs, using _all_docs endpoint which returns _id and _rev (revision), mark them as _deleted and use the bulk insert/update API to delete them. Not sure if this is a proper solution since there might be a huge number of documents.
> 
> Another option would be to delete the database-store. This seems to be the worst solution since the documents history will be permanently lost.
> 
> Any ideas?
> 
> b) Filtering
> 
> AFAIK, in order to perform filtering in a CouchDB database, a design document and an appropriate view has to be created. My thought is that the AGJS adapter should not create the view, instead we should assume that the user has created the appopriate views and provide a setting in AGJS where the view endpoint URl can be set. 
> 
> Any ideas about filtering and the proper way to be implemented?
> 
> Thanks,
> Tolis
> 
> [1]: https://github.com/tolis-e/aerogear-js/commit/0cf952c36ea0f31aec2a6732d89eb469fd4a3d09
> 
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