In case someone stumbles upon this and wants a better solution, you can specify the “contentType: ‘application/json'” option in the .ajax call and have Rails properly parse the JSON object without garbling it into integer-keyed hashes with all-string values.
So, to summarize, my problem was that this:
$.ajax({
type : "POST",
url : 'http://localhost:3001/plugin/bulk_import/',
dataType: 'json',
data : {"shared_items": [{"entity_id":"253","position":1}, {"entity_id":"823","position":2}]}
});
resulted in Rails parsing things as:
Parameters: {"shared_items"=>{"0"=>{"entity_id"=>"253", "position"=>"1"}, "1"=>{"entity_id"=>"823", "position"=>"2"}}}
whereas this (NOTE: we’re now stringifying the javascript object and specifying a content type, so rails will know how to parse our string):
$.ajax({
type : "POST",
url : 'http://localhost:3001/plugin/bulk_import/',
dataType: 'json',
contentType: 'application/json',
data : JSON.stringify({"shared_items": [{"entity_id":"253","position":1}, {"entity_id":"823","position":2}]})
});
results in a nice object in Rails:
Parameters: {"shared_items"=>[{"entity_id"=>"253", "position"=>1}, {"entity_id"=>"823", "position"=>2}]}
This works for me in Rails 3, on Ruby 1.9.3.