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module ActiveRecord
# = Active Record Has Many Association
module Associations
# This is the proxy that handles a has many association.
#
# If the association has a <tt>:through</tt> option further specialization
# is provided by its child HasManyThroughAssociation.
class HasManyAssociation < AssociationCollection #:nodoc:
protected
# Returns the number of records in this collection.
#
# If the association has a counter cache it gets that value. Otherwise
# it will attempt to do a count via SQL, bounded to <tt>:limit</tt> if
# there's one. Some configuration options like :group make it impossible
# to do an SQL count, in those cases the array count will be used.
#
# That does not depend on whether the collection has already been loaded
# or not. The +size+ method is the one that takes the loaded flag into
# account and delegates to +count_records+ if needed.
#
# If the collection is empty the target is set to an empty array and
# the loaded flag is set to true as well.
def count_records
count = if has_cached_counter?
@owner.send(:read_attribute, cached_counter_attribute_name)
elsif @reflection.options[:counter_sql] || @reflection.options[:finder_sql]
@reflection.klass.count_by_sql(custom_counter_sql)
else
@reflection.klass.count(@scope[:find].slice(:conditions, :joins, :include))
end
# If there's nothing in the database and @target has no new records
# we are certain the current target is an empty array. This is a
# documented side-effect of the method that may avoid an extra SELECT.
@target ||= [] and loaded if count == 0
[@reflection.options[:limit], count].compact.min
end
def has_cached_counter?
@owner.attribute_present?(cached_counter_attribute_name)
end
def cached_counter_attribute_name
"#{@reflection.name}_count"
end
def insert_record(record, force = false, validate = true)
set_owner_attributes(record)
save_record(record, force, validate)
end
# Deletes the records according to the <tt>:dependent</tt> option.
def delete_records(records)
case @reflection.options[:dependent]
when :destroy
records.each { |r| r.destroy }
when :delete_all
@reflection.klass.delete(records.map { |r| r.id })
else
updates = { @reflection.foreign_key => nil }
conditions = { @reflection.association_primary_key => records.map { |r| r.id } }
with_scope(@scope) do
@reflection.klass.update_all(updates, conditions)
end
end
if has_cached_counter? && @reflection.options[:dependent] != :destroy
@owner.class.update_counters(@owner.id, cached_counter_attribute_name => -records.size)
end
end
def construct_create_scope
construct_owner_attributes
end
end
end
end
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