ANN: Sequel 3.27.0 Released

Sequel is a lightweight database access toolkit for Ruby.

  • Sequel provides thread safety, connection pooling and a concise
    DSL for constructing SQL queries and table schemas.
  • Sequel includes a comprehensive ORM layer for mapping records to
    Ruby objects and handling associated records.
  • Sequel supports advanced database features such as prepared
    statements, bound variables, stored procedures, savepoints,
    two-phase commit, transaction isolation, master/slave
    configurations, and database sharding.
  • Sequel currently has adapters for ADO, Amalgalite, DataObjects,
    DB2, DBI, Firebird, Informix, JDBC, MySQL, Mysql2, ODBC, OpenBase,
    Oracle, PostgreSQL, SQLite3, Swift, and TinyTDS.

Sequel 3.27.0 has been released and should be available on the gem

= New Features

  • Model.dataset_module has been added for easily adding methods to
    a model’s dataset:

    Album.dataset_module do
    def with_name_like(x)
    def selling_at_least(x)
    filter{copies_sold > x}

    Previously, you could use def_dataset_method to accomplish the
    same thing. dataset_module is generally cleaner, plus you are
    using actual methods instead of blocks, so calling the methods
    is faster on some ruby implementations.

  • Sequel now uses a Sequel::SQLTime class (a subclass of Time) when
    dealing with values for SQL time columns (which don’t have a date
    component). These values are handled correctly when used in
    filters or insert/update statements (using only the time
    component), so Sequel can now successfully round trip values for
    time columns. Not all adapters support returning time column
    values as SQLTime instances, but the most common ones do.

  • You can now drop foreign key, primary key, and unique constraints
    on MySQL by passing the :type=>(:foreign_key|:primary_key|:unique)
    option to Database#drop_constraint.

  • The ODBC adapter now has initial support for the DB2 database, use
    the :db_type=>‘db2’ option to load the support.

= Other Improvements

  • The mysql2 adapter now uses native prepared statements.

  • The tinytds adapter now uses uses sp_executesql for prepared

  • DateTime and Time objects are now converted to Date objects when
    they are assigned to a date column in a Model instance.

  • When converting a Date object to a DateTime object, the resulting
    DateTime object now has no fractional day components. Previously,
    depending on your timezone settings, it could have had fractional
    day components.

  • The mysql2 adapter now supports stored procedures, as long as they
    don’t return results.

  • Mass assignment protection now handles including modules in model
    classes and extending model instances with modules. Previously, if
    you defined a setter method in a module, access to it may have been

  • The prepared_statements_safe plugin now works on classes without
    datasets, so you can now do the following to load it for all models:

    Sequel::Model.plugin :prepared_statements_safe

  • Dataset#hash now works correctly when handling SQL::Expression

  • Model#hash now correctly handles classes with no primary key or with
    a composite primary key.

  • Model#exists? now always returns false for new model objects.

= Backwards Compatibility

  • If you were previously setting primary key values manually for new
    model objects and then calling exists? to see if the instance is
    already in the database, you need to change your code from: