170 lines
6.2 KiB
Ruby
170 lines
6.2 KiB
Ruby
module ActiveRecord
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module Associations
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class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
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def initialize(owner, reflection)
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super
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construct_sql
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end
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def build(attributes = {})
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load_target
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record = @reflection.klass.new(attributes)
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@target << record
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record
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end
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def create(attributes = {})
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# Can't use Base.create since the foreign key may be a protected attribute.
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if attributes.is_a?(Array)
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attributes.collect { |attr| create(attr) }
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else
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record = build(attributes)
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insert_record(record) unless @owner.new_record?
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record
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end
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end
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def find_first
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load_target.first
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end
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def find(*args)
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options = Base.send(:extract_options_from_args!, args)
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# If using a custom finder_sql, scan the entire collection.
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if @reflection.options[:finder_sql]
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expects_array = args.first.kind_of?(Array)
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ids = args.flatten.compact.uniq
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if ids.size == 1
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id = ids.first.to_i
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record = load_target.detect { |record| id == record.id }
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expects_array ? [record] : record
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else
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load_target.select { |record| ids.include?(record.id) }
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end
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else
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conditions = "#{@finder_sql}"
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if sanitized_conditions = sanitize_sql(options[:conditions])
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conditions << " AND (#{sanitized_conditions})"
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end
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options[:conditions] = conditions
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options[:joins] = @join_sql
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options[:readonly] = finding_with_ambigious_select?(options[:select])
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if options[:order] && @reflection.options[:order]
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options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
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elsif @reflection.options[:order]
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options[:order] = @reflection.options[:order]
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end
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merge_options_from_reflection!(options)
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# Pass through args exactly as we received them.
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args << options
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@reflection.klass.find(*args)
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end
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end
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# Deprecated as of Rails 1.2. If your associations require attributes
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# you should be using has_many :through
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def push_with_attributes(record, join_attributes = {})
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raise_on_type_mismatch(record)
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join_attributes.each { |key, value| record[key.to_s] = value }
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callback(:before_add, record)
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insert_record(record) unless @owner.new_record?
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@target << record
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callback(:after_add, record)
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self
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end
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deprecate :push_with_attributes => "consider using has_many :through instead"
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alias :concat_with_attributes :push_with_attributes
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protected
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def method_missing(method, *args, &block)
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if @target.respond_to?(method) || (!@reflection.klass.respond_to?(method) && Class.respond_to?(method))
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super
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else
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@reflection.klass.with_scope(:find => { :conditions => @finder_sql, :joins => @join_sql, :readonly => false }) do
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@reflection.klass.send(method, *args, &block)
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end
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end
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end
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def count_records
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load_target.size
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end
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def insert_record(record)
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if record.new_record?
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return false unless record.save
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end
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if @reflection.options[:insert_sql]
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@owner.connection.execute(interpolate_sql(@reflection.options[:insert_sql], record))
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else
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columns = @owner.connection.columns(@reflection.options[:join_table], "#{@reflection.options[:join_table]} Columns")
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attributes = columns.inject({}) do |attributes, column|
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case column.name
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when @reflection.primary_key_name
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attributes[column.name] = @owner.quoted_id
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when @reflection.association_foreign_key
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attributes[column.name] = record.quoted_id
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else
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if record.attributes.has_key?(column.name)
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value = @owner.send(:quote_value, record[column.name], column)
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attributes[column.name] = value unless value.nil?
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end
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end
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attributes
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end
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sql =
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"INSERT INTO #{@reflection.options[:join_table]} (#{@owner.send(:quoted_column_names, attributes).join(', ')}) " +
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"VALUES (#{attributes.values.join(', ')})"
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@owner.connection.execute(sql)
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end
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return true
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end
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def delete_records(records)
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if sql = @reflection.options[:delete_sql]
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records.each { |record| @owner.connection.execute(interpolate_sql(sql, record)) }
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else
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ids = quoted_record_ids(records)
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sql = "DELETE FROM #{@reflection.options[:join_table]} WHERE #{@reflection.primary_key_name} = #{@owner.quoted_id} AND #{@reflection.association_foreign_key} IN (#{ids})"
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@owner.connection.execute(sql)
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end
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end
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def construct_sql
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interpolate_sql_options!(@reflection.options, :finder_sql)
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if @reflection.options[:finder_sql]
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@finder_sql = @reflection.options[:finder_sql]
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else
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@finder_sql = "#{@reflection.options[:join_table]}.#{@reflection.primary_key_name} = #{@owner.quoted_id} "
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@finder_sql << " AND (#{conditions})" if conditions
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end
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@join_sql = "INNER JOIN #{@reflection.options[:join_table]} ON #{@reflection.klass.table_name}.#{@reflection.klass.primary_key} = #{@reflection.options[:join_table]}.#{@reflection.association_foreign_key}"
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end
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# Join tables with additional columns on top of the two foreign keys must be considered ambigious unless a select
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# clause has been explicitly defined. Otherwise you can get broken records back, if, say, the join column also has
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# and id column, which will then overwrite the id column of the records coming back.
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def finding_with_ambigious_select?(select_clause)
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!select_clause && @owner.connection.columns(@reflection.options[:join_table], "Join Table Columns").size != 2
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end
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end
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end
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end
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