How to specify a separate gridfs host?

[raulccabreu]

Instead of connect to the mongoid configured one (usually the used to store model documents).

This can be useful on cluster configurations with different number for files and documents hosts.

[syntruth]

I had to figure this out for myself as well, since the code is a bit less than clear on how to do this, but it is possible, by giving the File and Chunk model a store_in hash.

gridfs = Mongoid::GridFs
gridfs.file_model.store_in database: 'db_name_here'
gridfs.chunk_model.store_in database: 'db_name_here'

This can then be confirmed with:

gridfs.file_model.collection

In my apps file model (in this case, for ActiveDirectory user photos), I have a convenience memoized set up method:

def self.gridfs
  @gridfs ||= begin
    gridfs = Mongoid::GridFs

    gridfs.file_model.store_in database: AD.database_name
    gridfs.chunk_model.store_in database: AD.database_name

    gridfs
  end
end

So far, that seems to work, allowing me to store those files in a single database, but access them from 3 separate web-apps.