On Wednesday, November 21, 2012 10:56:58 AM UTC, Ruby-Forum.com User wrote:
>
>
> Instead of writing a simple SQL request, you write a complicated set of
> methods' invocations (with options...).
>
> The resulting code is not easy to read. You think : I should write an
> easy to read SQL request!
>
>
Not sure I buy that.
I'd far rather write
Garment.join(:brand).where(:brands => {:published => true}, :category_id =>
jumpers)
than
find_by_sql(['select * from garments
inner join brands on garments.brand_id = brands.id
where brands.published = true AND category_id = ?', jumpers)
And it only gets better as the query grows in complexity - building up
strings is a pain in the arse, for example
Garment.where(criteria.reject {|k,v| v.blank?)
as opposed
to
criteria.collect |name, value|
"#{connection.quote name} = #{connection.quote value}"
end.join( ' AND ')
> Some says : yes, but by using the database abstraction, you can change
> you database easily (ex : from MySql to SQLServer)!
>
> OK, but... Did you ever change your database ?
>
> If you really need to migrate from MySql to SQLServer, then it means
> that you have a *deep* problem. You may need to restructure your
> database...
>
> It's certainly true that changing database will always be a big effort,
even if you write 0 lines of sql in your rails app.
> And what about "migrations" ?
>
> Migrations keep track of structure's changes. OK, but why don't you just
> keep your database's schema under SVN (or Git) ?
>
>
just storing the schema doesn't always tell you how to apply changes to
that schema
> Migrations can be used to change the database's content. OK, but
> everything is not reversible. And, by the way, you should always work on
> the testing environment.
>
> So, my question is :
>
> Do you really use all the Rails' tools to manage your database ?
>
>
I do
> Can you use Rails without Active Record ?
>
>
Absolutely. You could use data mapper for example or not use a SQL database
at all. I've built apps that only used couchdb or mongo or that didn't have
a persistence layer of their own at all.
Fred
> Thanks,
>
> Denis
>
> --
> Posted via http://www.ruby-forum.com/.
>
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