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module ActiveRecord
module Associations
class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
def initialize(owner, association_name, association_class_name, association_class_primary_key_name, join_table, options)
super(owner, association_name, association_class_name, association_class_primary_key_name, options)
@association_foreign_key = options[:association_foreign_key] || Inflector.underscore(Inflector.demodulize(association_class_name.downcase)) + "_id"
association_table_name = options[:table_name] || @association_class.table_name(association_class_name)
@join_table = join_table
@order = options[:order] || "t.#{@owner.class.primary_key}"
interpolate_sql_options!(options, :finder_sql, :delete_sql)
@finder_sql = options[:finder_sql] ||
"SELECT t.*, j.* FROM #{association_table_name} t, #{@join_table} j " +
"WHERE t.#{@owner.class.primary_key} = j.#{@association_foreign_key} AND " +
"j.#{association_class_primary_key_name} = '#{@owner.id}' " +
(options[:conditions] ? " AND " + options[:conditions] : "") + " " +
"ORDER BY #{@order}"
end
# Removes all records from this association. Returns +self+ so method calls may be chained.
def clear
return self if size == 0 # forces load_collection if hasn't happened already
if sql = @options[:delete_sql]
each { |record| @owner.connection.execute(sql) }
elsif @options[:conditions]
sql =
"DELETE FROM #{@join_table} WHERE #{@association_class_primary_key_name} = '#{@owner.id}' " +
"AND #{@association_foreign_key} IN (#{collect { |record| record.id }.join(", ")})"
@owner.connection.execute(sql)
else
sql = "DELETE FROM #{@join_table} WHERE #{@association_class_primary_key_name} = '#{@owner.id}'"
@owner.connection.execute(sql)
end
@collection = []
self
end
def find(association_id = nil, &block)
if block_given? || @options[:finder_sql]
load_collection
@collection.find(&block)
else
if loaded?
find_all { |record| record.id == association_id.to_i }.first
else
find_all_records(@finder_sql.sub(/ORDER BY/, "AND j.#{@association_foreign_key} = '#{association_id}' ORDER BY")).first
end
end
end
def push_with_attributes(record, join_attributes = {})
raise_on_type_mismatch(record)
insert_record_with_join_attributes(record, join_attributes)
join_attributes.each { |key, value| record.send(:write_attribute, key, value) }
@collection << record if loaded?
self
end
alias :concat_with_attributes :push_with_attributes
def size
@options[:uniq] ? count_records : super
end
protected
def find_all_records(sql = @finder_sql)
records = @association_class.find_by_sql(sql)
@options[:uniq] ? uniq(records) : records
end
def count_records
load_collection
@collection.size
end
def insert_record(record)
if @options[:insert_sql]
@owner.connection.execute(interpolate_sql(@options[:insert_sql], record))
else
sql = "INSERT INTO #{@join_table} (#{@association_class_primary_key_name}, #{@association_foreign_key}) VALUES ('#{@owner.id}','#{record.id}')"
@owner.connection.execute(sql)
end
end
def insert_record_with_join_attributes(record, join_attributes)
attributes = { @association_class_primary_key_name => @owner.id, @association_foreign_key => record.id }.update(join_attributes)
sql =
"INSERT INTO #{@join_table} (#{@owner.send(:quoted_column_names, attributes).join(', ')}) " +
"VALUES (#{attributes.values.collect { |value| @owner.send(:quote, value) }.join(', ')})"
@owner.connection.execute(sql)
end
def delete_records(records)
if sql = @options[:delete_sql]
records.each { |record| @owner.connection.execute(sql) }
else
ids = quoted_record_ids(records)
sql = "DELETE FROM #{@join_table} WHERE #{@association_class_primary_key_name} = '#{@owner.id}' AND #{@association_foreign_key} IN (#{ids})"
@owner.connection.execute(sql)
end
end
end
end
end
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