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Bump version to 3.4.0

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1 parent 41f182b commit 760424c66c3e7f9feb68854db2438724d0bbd71e @jeremyevans committed Sep 2, 2009
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  1. +1 −1 CHANGELOG
  2. +325 −0 doc/release_notes/3.4.0.txt
  3. +1 −1 lib/sequel/version.rb
@@ -1,4 +1,4 @@
-=== HEAD
+=== 3.4.0 (2009-09-02)
* Allow datasets without tables to work correctly on Oracle (mikegolod)
@@ -0,0 +1,325 @@
+New Plugins
+* A nested_attributes plugin was added allowing you to modify
+ associated objects directly through a model object, similar to
+ ActiveRecord's Nested Attributes.
+ Artist.plugin :nested_attributes
+ Artist.one_to_many :albums
+ Artist.nested_attributes :albums
+ a =>'YJM',
+ :albums_attributes=>[{:name=>'RF'}, {:name=>'MO'}])
+ # No database activity yet
+ # Saves artist and both albums
+{|x|} # ['RF', 'MO']
+ It takes most of the same options as ActiveRecord, as well as a
+ a few additional options:
+ * :destroy - Allow destruction of nested records.
+ * :limit - For *_to_many associations, a limit on the number of
+ records that will be processed, to prevent denial of service
+ attacks.
+ * :remove - Allow disassociation of nested records (can remove the
+ associated object from the parent object, but not destroy the
+ associated object).
+ * :strict - Set to false to not raise an error message if a primary
+ key is provided in a record, but it doesn't match an existing
+ associated object.
+ If a block is provided, it is passed each nested attribute hash.
+ If the hash should be ignored, the block should return anything
+ except false or nil.
+* A timestamps plugin was added for automatically adding
+ before_create and before_update hooks for setting values on
+ timestamp columns. There are a couple of existing external
+ plugins that handle timestamps, but the implementations are
+ suboptimal. The new built-in plugin supports the following
+ options (with the default in parentheses):
+ * :create - The field to hold the create timestamp (:created_at)
+ * :force - Whether to overwrite an existing create timestamp
+ (false)
+ * :update - The field to hold the update timestamp (:updated_at)
+ * :update_on_create - Whether to set the update timestamp to the
+ create timestamp when creating (false)
+* An instance_hooks plugin was added for adding hooks to specific
+ w
+ model instances:
+ obj =
+ obj.after_save_hook{do_something}
+ # calls do_something after the obj has been saved
+ All of the standard hooks are supported, except for
+ after_initialize. Instance level before hooks are executed in
+ reverse order of addition before calling super. Instance level
+ after hooks are executed in order of addition after calling super.
+ If any of the instance level before hook blocks return false, no
+ more instance level before hooks are called and false is returned.
+ Instance level hooks are cleared when the object is saved
+ successfully.
+* A boolean_readers plugin was added for creating attribute? methods
+ for boolean columns. This can provide a nicer API:
+ obj = Model[1]
+ # Sequel default column reader
+ # Using the boolean_readers plugin
+ You can provide a block when loading the plugin to change the
+ criteria used to determine if the column is boolean:
+ Sequel::Model.plugin(:boolean_readers) do |c|
+ db_schema[c][:db_type] =~ /\Atinyint/
+ end
+ This may be useful if you are using MySQL and have some tinyint
+ columns that represent booleans and others that represent integers.
+ You can turn the convert_tinyint_to_bool setting off and use the
+ attribute methods for the integer value and the attribute? methods
+ for the boolean value.
+Other New Features
+* Sequel now has support for converting Time/DateTime to local or UTC
+ time upon storage, retrieval, or typecasting.
+ There are three different timezone settings:
+ * Sequel.database_timezone - The timezone that timestamps use in
+ the database. If the database returns a time without an offset,
+ it is assumed to be in this timezone.
+ * Sequel.typecast_timezone - Similar to database_timezone, but used
+ for typecasting data from a source other than the database. This
+ is currently only used by the model typecasting code.
+ * Sequel.application_timezone - The timezone that the application
+ wants to deal with. All Time/DateTime objects are converted into
+ this timezone upon retrieval from the database.
+ Unlike most things in Sequel, these are only global settings, you
+ cannot change them per database. There are only three valid
+ timezone settings:
+ * nil (the default) - Don't do any timezone conversion. This is
+ the historical behavior.
+ * :local - Convert to local time/Consider time to be in local time.
+ * :utc - Convert to UTC/Consider time to be in UTC.
+ So if you want to store times in the database as UTC, but deal with
+ them in local time in the application:
+ Sequel.application_timezone = :local
+ Sequel.database_timezone = :utc
+ If you want to set all three timezones to the same value:
+ Sequel.default_timezone = :utc
+ There are three conversion methods that are called:
+ * Sequel.database_to_application_timestamp - Called on time objects
+ coming out of the database. If the object coming out of the
+ database (usually a string) does not have an offset, assume it is
+ already in the database_timezone. Return a Time/DateTime object
+ (depending on Sequel.datetime_class), in the application_timzone.
+ * Sequel.application_to_database_timestamp - Used when literalizing
+ Time/DateTime objects into an SQL string. Converts the object to
+ the database_timezone before literalizing them.
+ * Sequel.typecast_to_application_timestamp - Called when
+ typecasting objects for model datetime columns. If the object
+ being typecasted does not already have an offset, assume it is
+ already in the typecast_timezone. Return a Time/DateTime object
+ (depending on Sequel.datetime_class), in the
+ application_timezone.
+ Sequel does not yet support named timezones or per thread
+ modification of the timezone (for showing all timestamps in the
+ current user's timezone). Extensions to support both features are
+ planned for a future version.
+* Dataset#truncate was added for truncating tables. Truncate allows
+ for fast removal of all rows in a table.
+* Sequel now supports typecasting a hash to date, time, and datetime
+ types. This allows easy usage of Sequel with forms that split
+ the entry of these database types into separate from fields.
+ With this code, you can just have field names like:
+ date[year]
+ date[month]
+ date[day]
+ Rack will parse that into:
+ {'date'=>{'year'=>?, 'month'=>?, 'day'=>?}}
+ So then you can do:
+ = params['date']
+ # or
+ obj.set(params)
+* validates_unique now takes a block that can be used to scope the
+ uniqueness constraint. This allows you to easily set up uniqueness
+ validations that are only necessary in a given scope. For example,
+ a validation on username, but only for active users (as inactive
+ users are soft deleted but remain in the table). You just pass a
+ block to validates_unique:
+ validates_unique(:name){|ds| ds.filter(:active)}
+* The serialization plugin now supports json.
+* Sequel now supports generic concepts of
+ CURRENT_{DATE,TIME,TIMESTAMP}. Most databases support these SQL
+ concepts, but not all, and some implementations act differently.
+ The Sequel::SQL::Constants module holds the three constants,
+ which are instances of SQL::Constant, an SQL::GenericExpression
+ subclass. This module is included in Sequel, so you can reference
+ the constants more easily (e.g. Sequel::CURRENT_TIMESTAMP).
+ It's separated out into a separate module so that you can just
+ include that module in the top level scope, allowing you to
+ reference the constants directly (e.g. CURRENT_TIMESTAMP).
+ DB[:events].filter{date < ::Sequel::CURRENT_DATE}
+ # or:
+ include Sequel::SQL::Constants
+ DB[:events].filter{date < ::CURRENT_DATE}
+* Database#run was added for executing arbitrary SQL on a database.
+ It's an alias for Database#<<, but it allows for a nicer API inside
+ migrations, since you can now do:
+ run 'SQL'
+ instead of:
+ self << 'SQL'
+ You can also provide a :server option to run the SQL on the
+ given server/shard:
+ run 'SQL', :server=>:shard1
+* Sequel::Model() can now take a database argument in addition to
+ a symbol or dataset argument. If a database is given, it'll create
+ an anonymous subclass attached to the given database. Other changes
+ were made to allow the following code to work:
+ class Item < Sequel::Model(DB2)
+ end
+ That will work correctly assuming a table named items in DB2.
+* Dataset#ungrouped was added for removing a grouping from an
+ existing dataset. Also, Dataset#group when called with no arguments
+ or with a nil argument also removes any existing grouping instead
+ of resulting in invalid SQL.
+* Model#modified? was added, letting you know if the model has been
+ modified. If the model hasn't been modified, calling
+ Model#save_changes will do nothing.
+* SQL::OrderedExpression now supports #asc, #desc, and #invert.
+Other Improvements
+* The serialization and lazy_attribute plugins now add accessor
+ methods to a module included in the class, instead of to the
+ model class itself. This allows the methods to be overridden
+ in the class and work well with super, as well for the plugins
+ to work together on the same column. Make sure the
+ lazy_attributes accessor is setup before the serialization
+ accessor if you want to have a lazy serialized column.
+* Calling the add_* method for many_to_many association now saves the
+ record if the record is new. This makes it operate more similarly
+ to one_to_many associations. Previously, it raised an Error.
+* Dataset#import now works correctly when called with a dataset.
+ Previously, it generated incorrect SQL.
+* The JDBC adapter now converts byte arrays to/from SQL::Blob.
+* The JDBC adapter now attempts to bind unknown types using
+ setObject instead of raising, so it can work with native Java
+ objects. It also binds boolean parameters correctly.
+* Using multiple emulated ALTER TABLE statements (such as
+ drop_column) in a single alter_table block now works correctly
+ on SQLite.
+* Database#indexes now works on JDBC for tables in a non-default
+ schema. It also now properly detects unique indexes on MSSQL.
+* Database#schema on JDBC now accepts a :schema option. Also,
+ returned schema hashes now include a :column_size entry specifying
+ the maximum length/precision for the column, since the
+ :db_type entry doesn't have contain the information on JDBC.
+* Datasets without tables now work correctly on Oracle, so things
+ like DB.get(...) now work.
+* A descriptive error message is given if you attempt to use
+ Sequel with the mysql.rb driver (which Sequel doesn't support).
+* The postgres adapter now works correctly with a modified
+ postgres-pr that raises PGErrors instead of RuntimeErrors
+ (e.g.
+* You now get a Sequel::InvalidOperation instead of a NoMethodError
+ if you attempt to update a dataset without a table.
+* The inflection support has been modified to reduce code
+ duplication.
+Backwards Compatibility
+* Sequel now includes fractional seconds in timestamps for all
+ adapters except MySQL. It's possible that this may break
+ timestamp columns for databases that are not regularly tested.
+* Sequel now includes timezone values in timestamps on Microsoft
+ SQL Server, Oracle, PostgreSQL and SQLite. The modification for
+ SQLite is probably the biggest cause for concern, since SQLite
+ stores times as text. If you have an SQLite database that uses
+ timestamps and is accessed by something other than Sequel, you
+ should make sure that it works with the timestamp format that
+ Sequel now uses.
+* The default timestamp format used by Sequel now uses a space
+ instead of 'T' between the date and time parts, which could
+ possibly affect some databases that are not regularly tested.
+* Attempting to insert into a grouped dataset or a dataset that
+ selects from multiple tables will now raise an Error. Previously,
+ it would ignore any GROUP or JOIN settings and generate bad SQL if
+ there were multiple FROM tables.
+* Database#<< now always returns nil. Before, the return value was
+ adapter dependent.
+* ODBC::Time and ODBC::DateTime values are now converted to the
+ Sequel.datetime_class. Before, ODBC::Time used Time and
+ ODBC::DateTime used DateTime regardless of the
+ Sequel.datetime_class setting.
+* The default inflections were modified, fixing some obvious errors
+ and possibly changing some existing inflections. Further changes
+ to the default inflections are unlikely.
@@ -1,6 +1,6 @@
module Sequel
- MINOR = 3
+ MINOR = 4
TINY = 0

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