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MongoDB Atlas runs apps anywhere
Deploy in 115+ regions with the modern database for every enterprise.
MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
Classier solution for file uploads for Rails, Sinatra and others
...Now you can cache files by assigning them to the attribute, they will automatically be stored when the record is saved. CarrierWave also has convenient support for multiple file upload fields. Add a column which can store an array. This could be an array column or a JSON column for example. Your choice depends on what your database supports.