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A default Rails application is typically built with a relational database, such as PostgreSQL or MySQL, as its default data store. Building a Rails application with a NoSQL database can bring some benefits. As an opinionated framework, it makes the assumption that there is a “best” way to do things, and it’s designed to encourage that way - and in some cases to discourage alternatives. This quote is extracted from the Rails documentation, and one could infer that an application diverging from...