/usr/share/doc/ruby-sequel/doc/release_notes/2.9.0.txt is in ruby-sequel 3.33.0-1.
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* Compound SQL statement (i.e. UNION, EXCEPT, and INTERSECT) support
is much improved. Chaining compound statement calls now longer
wipes out previous compound statements calls of the same type.
Also, the ordering of the compound statements is no longer fixed
per adapter, it now reflects the order they were called on the
object. For example, the following now work as expected:
ds1.union(ds2).union(ds3)
ds1.except(ds2).except(ds3)
ds1.intersect(ds2).intersect(ds3)
ds1.union(ds2).except(ds3)
ds1.except(ds2).intersect(ds3)
ds1.intersect(ds2).union(ds3)
* Exception classes ValidationFailure and BeforeHookFailure were
added so it is eaiser to catch a failed validation. These are
both subclasses of Sequel::Error, so there shouldn't be any
backwards compatibility issues. Error messages are also improved,
as the ValidationFailure message is a string containing all
validation failures and the BeforeHookFailure message contains
which hook type caused the failure (i.e. before_save,
before_create, or before_validate).
* The sequel command line tool now has a -L option to load
all files in the given directory. This is mainly useful for
loading a directory of model files. The files are loaded
after the database connection is set up.
* Methods to create and drop database functions, triggers, and
procedural languages were added to the PostgreSQL adapter.
Other Improvements
------------------
* Database#schema now raises an error if you pass a table that
doesn't exist. Before, some adapters would return an empty schema.
The bigger problem with this is that it made table_exists? return
the wrong value, since it looks at the Database's schema.
Generally, this bug would show up in the following code:
class Blah < Sequel::Model
end
Blah.table_exists? # True even if blahs is not a table
* AlterTableGenerator#add_foreign_key now works for MySQL.
* Error messages in model association methods that add/remove an
associated object are now more descriptive.
* Dataset#destroy for model datasets now works with databases that
can't handle nested queries. However, it now loads all model
objects being destroyed before attempting to destroy any of them.
* Dataset#count now works correctly for compound SQL statements
(i.e. UNION, EXCEPT, and INTERSECT).
* BigDecimal NaN and (+/-)Infinity values are now literalized
correctly. Database support for this is hit or miss. Sqlite will
work correctly, PostgreSQL raises an error if you try to store an
infinite value in a numeric column (though it works for float
columns), and MySQL converts all three to 0.
* The SQLite adapter no longer loses primary key information when
dropping columns.
* The SQLite adapter now supports dropping indicies.
* A bug in the MSSQL adapter's literalization of LiteralStrings has
been fixed.
* The literalization of blobs on PostgreSQL (bytea columns) has been
fixed.
* Sequel now raises an error if you attempt to subclass Sequel::Model
before setting up a database connection.
* The native postgresql adapter has been changed to only log client
messages of level WARNING by default. You can modify this via:
Sequel::Postgres.client_min_messages = nil # Use Server Default
Sequel::Postgres.client_min_messages = :notice # Use NOTICE level
* Model#inspect now calls Model#inspect_values for easier
overloading.
Backwards Compatibilty
----------------------
* The API to Model#save_failure (a private method) was changed to
remove the second argument.
* SQLite columns with type numeric, decimal, or money are now
returned as BigDecimal values. Before, they were probably returned
as strings.
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