ANN: Sequel 0.4.3 Released

Sequel version 0.4.3 has just been released. This release includes
numerous improvements and bug fixes. Here’s a list of the changes:

=== Database-related

  • Added Database#add_index method, letting you add indexes without
    having to create a schema:

    DB.add_index(:items, :node_id)

  • Added support for inline index definition. Instead of adding an
    index statement for each column you want to create, you can just add
    an index option:

    DB.create_table(:items) do
    text :name, :index => true
    end

  • Added Database#create_table! method for forcibly creating a table.
    This method will drop the table (if it exists) before creating it
    again.

  • Added Database#create_view, #create_or_replace_view and #drop_view
    methods. You can supply either a dataset or an SQL as the source for
    the view. For example:

    DB.create_view(:my_view, ‘SELECT x FROM y’)
    DB.create_view(:another_view, DB[:items].where {!:item_sucks})

Also implemented are Dataset#create_view and #create_or_replace_view
convenience methods.

DB[:items].where(:active => true).create_view(:active_items)

=== Dataset-related

  • Dataset#update can now accept blocks or plain strings. You can now
    supply a custom string with assignment expressions:

    DB[:items].update(“x = 1”)
    #=> “UPDATE items SET x = 1”

You can also now supply a block to update:

DB[:items].update do
:x << 1
:y << 2
end
#=> “UPDATE items SET x = 1, y = 2”

This is very useful if you need to do stuff like incrementing a
counter column or using a custom SQL expression:

DB[:items].update {:count << :count + 1}
#=> “UPDATE items SET count = count + 1”

DB[:items].update {:featured << :price < 100}
#=> “UPDATE items SET featured = price < 100”

  • Added support for subscript access using Symbol#| operator. If you
    use array types in your tables you now have an easy way of accessing
    array items:

    DB[:items].select((:year|1).as(:value)).sql
    #=> “SELECT year[1] AS value FROM items”

    ds = DB[:items].where {:month|1 > 0}
    ds.update {(:year|1) << (:year|1) + (:month|1)}
    #=> "UPDATE items SET year[1] = (year[1] + month[1]) WHERE (month[1]

0)"

You can also access items in multi-dimensional arrays:

DB[:items].where {:bits|1|2|3 > 0}.sql
#=> “SELECT * FROM items WHERE (bits[1, 2, 3] > 0)”

=== Model-related

  • Added Model.create_with_params method that filters the given
    parameters accordring to the model’s columns (thanks Aman G.). This
    method was added by to request from users of Merb and Ramaze that
    wanted a simple way to create a model instance from request
    parameters. The method filters out any parameters that do not have
    corresponding columns in the underlying dataset.

=== Miscellaneous

  • Fixed Model.[] to raise for boolean argument (#97).

  • Added error reporting for filtering on comparison not in a block
    (thanks Jim M.).

  • Fixed Dataset#count to work properly with datasets with fixed SQL
    (when using #fetch).

  • Refactored and fixed Dataset#reverse_order to work with field
    quoting (thanks Christian).

  • Fixed problem with field quoting in insert statements.

  • Changed sequelizer code to silently fail on any error when requiring
    parsetree and ruby2ruby.

  • Keep DRY by re-using Model#[]= from method_missing.

  • Added Model.fetch alias for DB.fetch.set_model(Model).

=== More info

Sequel project page:
http://code.google.com/p/ruby-sequel

Sequel documentation:
http://sequel.rubyforge.org

Join the Sequel-talk group:
http://groups.google.com/group/sequel-talk

Install the gem:
sudo gem install sequel

Or check out the source and install manually:
svn co http://ruby-sequel.googlecode.com/svn/trunk sequel
cd sequel
rake install

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