Rails gem multiple NOSQL datastores - ruby-on-rails

Question

I'm creating my own gem and I want to enable user to save data to multiple NOSQL data stores. How can I make this happen? Where should I place the necessary files?

Answer 1

I've done the same thing in my gem. I think you have created an App folder in your gem/engine. Create another folder called "backend" and create classes for each datastore. For my case I created a seperate for Mongo and Redis
module Memberfier
class RedisStore
def initialize(redis)
#redis = redis
end
def keys
#redis.keys
end
def []=(key, value)
value = nil if value.blank?
#redis[key] = ActiveSupport::JSON.encode(value)
end
def [](key)
#redis[key]
end
def clear_database
#redis.keys.clone.each {|key| #redis.del key }
end
end
end
module Memberfier
class MongoStore
def initialize(collection)
#collection = collection
end
def keys
#collection.distinct :_id
end
def []=(key, value)
value = nil if value.blank?
collection.update({:_id => key},
{'$set' => {:value => ActiveSupport::JSON.encode(value)}},
{:upsert => true, :safe => true})
end
def [](key)
if document = collection.find_one(:_id => key)
document["value"]
else
nil
end
end
def destroy_entry(key)
#collection.remove({:_id => key})
end
def searchable?
true
end
def clear_database
collection.drop
end
private
def collection; #collection; end
end
end

Answer 2

You may have already seen one of Uncle Bob's presentations on application architecture. If not, it's here. I'd recommend having a single boundary object that select models inherit from. That boundary object could have multiple CRUD methods such as find, create, delete. That boundary object could inherit from whatever NOSQL adapter you configure. Example/source: http://hawkins.io/2014/01/pesistence_with_repository_and_query_patterns/