[Rails] using mongodb with ActiveRecord or other ?

 We recently looked at mongoDB a bit. I was discussing using mongoDB with active record but was told that maybe there are other or better options. Can someone comment on that ?

 Also, someone suggested storing a ruby array directly inside of a record where I would have opted for the array to be a separate set of records in active record using has_many and belongs_to .. It seemed to me that how I search on those child records would be a big factor but I soon realized I need to find out what are the options. Do people store arrays and hashes directly in mongo DB fields or is that not the best way to go ?

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