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module ActiveRecord
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:
def initialize(owner, reflection)
@finder_sql = nil
super
end
protected
def owner_quoted_id
if @reflection.options[:primary_key]
quote_value(@owner.send(@reflection.options[:primary_key]))
else
@owner.quoted_id
end
end
# 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 a 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.klass.count_by_sql(@counter_sql)
else
@reflection.klass.count(:conditions => @counter_sql, :include => @reflection.options[: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
if @reflection.options[:limit]
count = [ @reflection.options[:limit], count ].min
end
return count
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_belongs_to_association_for(record)
force ? record.save! : record.save(:validate => 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 { |record| record.id })
else
relation = Arel::Table.new(@reflection.table_name)
relation.where(relation[@reflection.primary_key_name].eq(@owner.id).
and(Arel::Predicates::In.new(relation[@reflection.klass.primary_key], records.map(&:id)))
).update(relation[@reflection.primary_key_name] => nil)
@owner.class.update_counters(@owner.id, cached_counter_attribute_name => -records.size) if has_cached_counter?
end
end
def target_obsolete?
false
end
def construct_sql
case
when @reflection.options[:finder_sql]
@finder_sql = interpolate_sql(@reflection.options[:finder_sql])
when @reflection.options[:as]
@finder_sql =
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_id = #{owner_quoted_id} AND " +
"#{@reflection.quoted_table_name}.#{@reflection.options[:as]}_type = #{@owner.class.quote_value(@owner.class.base_class.name.to_s)}"
@finder_sql << " AND (#{conditions})" if conditions
else
@finder_sql = "#{@reflection.quoted_table_name}.#{@reflection.primary_key_name} = #{owner_quoted_id}"
@finder_sql << " AND (#{conditions})" if conditions
end
construct_counter_sql
end
def construct_scope
create_scoping = {}
set_belongs_to_association_for(create_scoping)
{
:find => { :conditions => @finder_sql, :readonly => false, :order => @reflection.options[:order], :limit => @reflection.options[:limit], :include => @reflection.options[:include]},
:create => create_scoping
}
end
def we_can_set_the_inverse_on_this?(record)
inverse = @reflection.inverse_of
return !inverse.nil?
end
end
end
end
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