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= New Features
* Model#get_column_value and #set_column_value have been added for
getting/setting column values. Historically, to get column
values, you would just send the column name, and to set column
values you would send the column name suffixed by =. However,
this doesn't work when such methods are already defined by
ruby or Sequel itself (e.g. class, model, object_id).
Both #get_column_value and #set_column_value are just aliases to
#send, but you can safely override the methods to handle column
names that conflict with existing method names. Both the core
model code and all of the plugins that ship with Sequel have
been updated to use these new methods. External plugins are
strongly encouraged to switch to these new methods.
* A column_conflicts plugin has been added to automatically handle
columns that conflict with existing method names. So if you
have a column named "model" in your table, you can just load the
column_conflicts plugin and Sequel will handle things correctly.
* A accessed_columns plugin has been added, which records which
columns have been accessed for a model instance. This is useful
in development when you are planning on restricted the columns
selected by the dataset that retrieved the instance. SELECTing
only the columns you need can result in significant performance
increases, and the accessed_columns plugin makes that easier.
* Model#cancel_action has been added for canceling actions in
before hooks, instead of having the before hook methods return
false (which is still supported). In addition to being easier to
use, this also makes it possible to use custom exception messages
for hook failures, if you are using the default behavior of raising
exceptions on save failures.
= Other Improvements
* Dataset#union, #intersect, and #except now automatically handle
datasets with raw SQL, by wrapping such datasets in subqueries.
* The integer migrator now stores the correct migration number
when migrating with allow_missing_migration_files set.
* A :timeout=>nil Database option on MySQL no longer sets a
wait_timeout.
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