json.partial! doesn't support :collection

[rails]

json.partial! doesn't support :collection

[bwillis]

This is now supported in this commit: e2a6616 and is available in gem version 0.4.3.

It allows you to supply a hash with the collection:

json_partial! partial: "projects/index", collection: @projects

[mattgrayson]

I'm not sure this is working correctly. Passing a collection to json.partial! works - but only renders the last item in the array.

Edit: from debugger and log output, it looks like the partial is getting processed for each item in the collection. But jbuilder output only returns the last item in the collection.

[bwillis]

To expand a little on what @mattgrayson found, it is processing the collection elements and merging them into the template, but because the template is based on a hash, the properties of each object in the collection are replacing the value of the previous one. The assumption seems to be that rendering with a collection expects the rendered partials can safely be appended to the view, which is ok for html/erb, but this breaks with jbuilder.

I looked into adding this into jbuilder and it would seem to have to duplicate a lot of what rails is doing in it's renderers. IMO, I'm not sure it's worth supporting it when you can use the array method.

[dhh]

We are not going to support this at this time. You'll just need to loop yourself.