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module ActiveRecord
# = Active Record Has And Belongs To Many Association
module Associations
class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
def create(attributes = {})
create_record(attributes) { |record| insert_record(record) }
end
def create!(attributes = {})
create_record(attributes) { |record| insert_record(record, true) }
end
def columns
@reflection.columns(@reflection.options[:join_table], "#{@reflection.options[:join_table]} Columns")
end
def reset_column_information
@reflection.reset_column_information
end
def has_primary_key?
@has_primary_key ||= @owner.connection.supports_primary_key? && @owner.connection.primary_key(@reflection.options[:join_table])
end
protected
def construct_find_options!(options)
options[:joins] = @join_sql
options[:readonly] = finding_with_ambiguous_select?(options[:select] || @reflection.options[:select])
options[:select] ||= (@reflection.options[:select] || '*')
end
def count_records
load_target.size
end
def insert_record(record, force = true, validate = true)
if record.new_record?
if force
record.save!
else
return false unless record.save(:validate => validate)
end
end
if @reflection.options[:insert_sql]
@owner.connection.insert(interpolate_sql(@reflection.options[:insert_sql], record))
else
relation = Arel::Table.new(@reflection.options[:join_table])
attributes = columns.inject({}) do |attrs, column|
case column.name.to_s
when @reflection.primary_key_name.to_s
attrs[relation[column.name]] = owner_quoted_id
when @reflection.association_foreign_key.to_s
attrs[relation[column.name]] = record.quoted_id
else
if record.has_attribute?(column.name)
value = @owner.send(:quote_value, record[column.name], column)
attrs[relation[column.name]] = value unless value.nil?
end
end
attrs
end
relation.insert(attributes)
end
return true
end
def delete_records(records)
if sql = @reflection.options[:delete_sql]
records.each { |record| @owner.connection.delete(interpolate_sql(sql, record)) }
else
relation = Arel::Table.new(@reflection.options[:join_table])
relation.where(relation[@reflection.primary_key_name].eq(@owner.id).
and(Arel::Predicates::In.new(relation[@reflection.association_foreign_key], records.map(&:id)))
).delete
end
end
def construct_sql
if @reflection.options[:finder_sql]
@finder_sql = interpolate_sql(@reflection.options[:finder_sql])
else
@finder_sql = "#{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.primary_key_name} = #{owner_quoted_id} "
@finder_sql << " AND (#{conditions})" if conditions
end
@join_sql = "INNER JOIN #{@owner.connection.quote_table_name @reflection.options[:join_table]} ON #{@reflection.quoted_table_name}.#{@reflection.klass.primary_key} = #{@owner.connection.quote_table_name @reflection.options[:join_table]}.#{@reflection.association_foreign_key}"
construct_counter_sql
end
def construct_scope
{ :find => { :conditions => @finder_sql,
:joins => @join_sql,
:readonly => false,
:order => @reflection.options[:order],
:include => @reflection.options[:include],
:limit => @reflection.options[:limit] } }
end
# Join tables with additional columns on top of the two foreign keys must be considered ambiguous unless a select
# clause has been explicitly defined. Otherwise you can get broken records back, if, for example, the join column also has
# an id column. This will then overwrite the id column of the records coming back.
def finding_with_ambiguous_select?(select_clause)
!select_clause && columns.size != 2
end
private
def create_record(attributes, &block)
# Can't use Base.create because the foreign key may be a protected attribute.
ensure_owner_is_not_new
if attributes.is_a?(Array)
attributes.collect { |attr| create(attr) }
else
build_record(attributes, &block)
end
end
end
end
end
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