Since this entire book covers the niche topic of Active Record for Ruby, it??™s probably safe
to assume that you already know at least the very basics of what the Ruby Active Record library
is. That is, you??™ve heard that it??™s an object relational mapping (ORM) library that is the model
part of the Rails model, view, controller (MVC) framework and primarily allows for create,
read, update, and delete (CRUD) database operations. If nothing else, you got that much
information from the back cover of this book!
But maybe you skipped the back cover and just flipped to this section to see if this book is
worth buying (it is, and we recommend two copies; we hear it makes a great gift!), or maybe
you??™re like us and hate acronyms, or your eyes just glaze over when you hear many technical
terms in a row like that. Whatever the case, we don??™t feel like this explanation helps people to
understand what Active Record really is or what can actually be done with it. So here??™s our layman??™s
explanation, which we hope is a bit more direct and easier to digest:
Active Record is a Ruby library that allows your Ruby programs to transmit data and
commands to and from various data stores, which are usually relational databases.
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