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POruby in-memory object database with unlimited instances
 

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    <p>I'm trying to get a sort of object database in memory which can support an arbitrary number of instances/connections. Lets start with the library example:</p> <p>Lets say I have a <code>Library</code> class. I can create as many instances of this class as I want.<br> Each instance of <code>Library</code> has a collection of <code>Library::Book</code> objects (accessible as <code>library.books</code>). This collection of books is specific to that library instance.<br> I also have <code>Library::Magazine</code> which behaves the same.<br> And with this I can do things like <code>library.books['Nineteen Eighty Four'].author</code>, <code>library.magazines.each {...}</code>, <code>library.magazines.delete(magazine)</code>.</p> <p>Now up to this point it isn't hard. Any database model library can handle it. However I want to be able to clone the "library". Meaning I can take an instance of <code>Library</code>, and do <code>library.clone</code>, and get a brand new library which is an exact duplicate of the origin. But the new copy will have it's own collection of <code>Books</code> and <code>Magazines</code> (which was created from the origin).<br> This means it should create a duplicate database, and both databases can be accessed simultaneously.</p> <p>It's this arbitrary number of databases with simultaneous access that seems to be very difficult. Ideally I would like it to be a relational database with foreign key constraints (so I can do something like <code>library.categories['fiction'].books.each {...}</code> and have a foreign key on the book referencing the category it's in).</p> <p>I've been hacking away with <a href="http://sequel.jeremyevans.net/" rel="nofollow">Sequel</a> for a bit, and it comes close in that it allows multiple sqlite in-memory databases. But it's proving extremely difficult to get it to support an arbitrary number of them (it wants a constant class representing each table in each database).</p>
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