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Update :dependent docs and improve its argument error message.

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7813 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Jeremy Kemper 2007-10-09 00:32:36 +00:00
parent cdc3c246c6
commit aa04635d8e
1 changed files with 31 additions and 33 deletions
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64
activerecord/lib/active_record/associations.rb
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@ -624,7 +624,6 @@ module ActiveRecord
# alongside this object by calling their destroy method. If set to <tt>:delete_all</tt> all associated
# objects are deleted *without* calling their destroy method. If set to <tt>:nullify</tt> all associated
# objects' foreign keys are set to +NULL+ *without* calling their save callbacks.
# May not be set if <tt>:exclusively_dependent</tt> is also set.
# * <tt>:finder_sql</tt> - specify a complete SQL statement to fetch the association. This is a good way to go for complex
# associations that depend on multiple tables. Note: When this option is used, +find_in_collection+ is _not_ added.
# * <tt>:counter_sql</tt> - specify a complete SQL statement to fetch the size of the association. If <tt>:finder_sql</tt> is
@ -705,7 +704,7 @@ module ActiveRecord
# SQL fragment, such as <tt>rank = 5</tt>.
# * <tt>:order</tt> - specify the order from which the associated object will be picked at the top. Specified as
# an <tt>ORDER BY</tt> SQL fragment, such as <tt>last_name, first_name DESC</tt>
# * <tt>:dependent</tt> - if set to <tt>:destroy</tt> (or +true+), the associated object is destroyed when this object is. If set to
# * <tt>:dependent</tt> - if set to <tt>:destroy</tt>, the associated object is destroyed when this object is. If set to
# <tt>:delete</tt>, the associated object is deleted *without* calling its destroy method. If set to <tt>:nullify</tt>, the associated
# object's foreign key is set to +NULL+. Also, association is assigned.
# * <tt>:foreign_key</tt> - specify the foreign key used for the association. By default this is guessed to be the name
@ -1117,43 +1116,42 @@ module ActiveRecord
[]
end
# See HasManyAssociation#delete_records. Dependent associations
# delete children, otherwise foreign key is set to NULL.
def configure_dependency_for_has_many(reflection)
# See HasManyAssociation#delete_records. Dependent associations
# delete children, otherwise foreign key is set to NULL.
if reflection.options.include?(:dependent)
# Add polymorphic type if the :as option is present
dependent_conditions = []
dependent_conditions << "#{reflection.primary_key_name} = \#{record.quoted_id}"
dependent_conditions << "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as]
dependent_conditions << sanitize_sql(reflection.options[:conditions]) if reflection.options[:conditions]
dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ")
# Add polymorphic type if the :as option is present
dependent_conditions = []
dependent_conditions << "#{reflection.primary_key_name} = \#{record.quoted_id}"
dependent_conditions << "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as]
dependent_conditions << sanitize_sql(reflection.options[:conditions]) if reflection.options[:conditions]
dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ")
case reflection.options[:dependent]
when :destroy
module_eval "before_destroy '#{reflection.name}.each { |o| o.destroy }'"
when :delete_all
module_eval "before_destroy { |record| #{reflection.class_name}.delete_all(%(#{dependent_conditions})) }"
when :nullify
module_eval "before_destroy { |record| #{reflection.class_name}.update_all(%(#{reflection.primary_key_name} = NULL), %(#{dependent_conditions})) }"
when nil
# pass
else
raise ArgumentError, 'The :dependent option expects either :destroy, :delete_all, or :nullify'
case reflection.options[:dependent]
when :destroy
module_eval "before_destroy '#{reflection.name}.each { |o| o.destroy }'"
when :delete_all
module_eval "before_destroy { |record| #{reflection.class_name}.delete_all(%(#{dependent_conditions})) }"
when :nullify
module_eval "before_destroy { |record| #{reflection.class_name}.update_all(%(#{reflection.primary_key_name} = NULL), %(#{dependent_conditions})) }"
else
raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, or :nullify (#{reflection.options[:dependent].inspect})"
end
end
end
def configure_dependency_for_has_one(reflection)
case reflection.options[:dependent]
when :destroy
module_eval "before_destroy '#{reflection.name}.destroy unless #{reflection.name}.nil?'"
when :delete
module_eval "before_destroy '#{reflection.class_name}.delete(#{reflection.name}.id) unless #{reflection.name}.nil?'"
when :nullify
module_eval "before_destroy '#{reflection.name}.update_attribute(\"#{reflection.primary_key_name}\", nil) unless #{reflection.name}.nil?'"
when nil
# pass
else
raise ArgumentError, "The :dependent option expects either :destroy, :delete or :nullify."
if reflection.options.include?(:dependent)
case reflection.options[:dependent]
when :destroy
module_eval "before_destroy '#{reflection.name}.destroy unless #{reflection.name}.nil?'"
when :delete
module_eval "before_destroy '#{reflection.class_name}.delete(#{reflection.name}.id) unless #{reflection.name}.nil?'"
when :nullify
module_eval "before_destroy '#{reflection.name}.update_attribute(\"#{reflection.primary_key_name}\", nil) unless #{reflection.name}.nil?'"
else
raise ArgumentError, "The :dependent option expects either :destroy, :delete or :nullify (#{reflection.options[:dependent].inspect})"
end
end
end