Forum: Ruby ANN: Sequel 0.1.6 Released

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Sharon R. (Guest)
on 2007-06-01 18:46
(Received via mailing list)
Sequel version 0.1.6 has just been released. New in this release is
support for literal expressions, Dataset#or and Dataset#and, and the
default join type is INNER JOIN. Various bug fixes courtesy of snok.

Sequel is a lightweight ORM library for Ruby. Sequel provides thread
safety, connection pooling and a concise DSL for constructing database
queries and table schemas.

Literal expressions

You can now use literal expressions in filters or update values:

  items.update_sql(:col2 => 'col1 + 10'.expr) #=>
    "UPDATE items SET col2 = col1 + 10"

  items.exclude {col1 > 'col2 + col3'.expr}.sql #=>
    "SELECT * FROM items WHERE NOT (col1 > col2 + col3)"

Dataset#or, #and

Pretty much self-explanatory:

  items.filter {col1 > 100}.or(:col2 => nil).sql #=>
    "SELECT * FROM items WHERE (col1 > 100) OR (col2 IS NULL)"

  items.filter {col1 > 100}.and(:col2 => nil).sql #=>
    "SELECT * FROM items WHERE (col1 > 100) AND (col2 IS NULL)"

Default join type

On advice from a dude named snok, I changed the default join type to
INNER, since that's what the SQL specs say. So now:

  DB[:a].join(:b, :a_id).sql #=>
    "SELECT * FROM a INNER JOIN b ON (b.a_id ="

SQLite Memory DB

The SQLite adapter always had support for memory DB's: 'sqlite:/:memory:'

Well, now it's even easier. Just omit the db name altogether: 'sqlite:/'


* Removed stub class methods from Model. Model.method_missing now
automagically creates stub methods as needed. This is the first step
on the way to turning the model class into a supercharged dataset, but
that's a topic for a separate post. Coming soon... :-)

* Fixed PrettyTable code so now model datasets can be printed just
like naked datasets (thanks snok).

* Fixed Model#method_missing to raise if an unknown attribute is
accessed. Up until now this was the cause for a lot of potential
hidden errors, as unintended method calls would be swallowed and

* Fixed ODBC timestamp conversion to support dates before 1970 and
after 2040 (thanks snok.)


Sequel documentation:

Join the Sequel-talk group:

Install the gem:
  sudo gem install sequel

Or check out the source and install manually:
  svn co sequel
  cd sequel
  rake install
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