113 lines
4.6 KiB
Ruby
113 lines
4.6 KiB
Ruby
module ActiveRecord
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module Associations
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class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
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def create(attributes = {})
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create_record(attributes) { |record| insert_record(record) }
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end
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def create!(attributes = {})
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create_record(attributes) { |record| insert_record(record, true) }
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end
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protected
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def construct_find_options!(options)
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options[:joins] = @join_sql
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options[:readonly] = finding_with_ambiguous_select?(options[:select] || @reflection.options[:select])
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options[:select] ||= (@reflection.options[:select] || '*')
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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, force=true)
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if record.new_record?
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if force
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record.save!
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else
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return false unless record.save
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end
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end
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if @reflection.options[:insert_sql]
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@owner.connection.insert(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 |attrs, column|
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case column.name.to_s
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when @reflection.primary_key_name.to_s
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attrs[column.name] = @owner.quoted_id
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when @reflection.association_foreign_key.to_s
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attrs[column.name] = record.quoted_id
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else
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if record.has_attribute?(column.name)
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value = @owner.send(:quote_value, record[column.name], column)
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attrs[column.name] = value unless value.nil?
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end
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end
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attrs
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end
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sql =
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"INSERT INTO #{@owner.connection.quote_table_name @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.insert(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.delete(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 #{@owner.connection.quote_table_name @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.delete(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 = "#{@owner.connection.quote_table_name @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 #{@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}"
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end
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def construct_scope
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{ :find => { :conditions => @finder_sql,
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:joins => @join_sql,
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:readonly => false,
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:order => @reflection.options[:order],
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:limit => @reflection.options[:limit] } }
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end
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# Join tables with additional columns on top of the two foreign keys must be considered ambiguous unless a select
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# clause has been explicitly defined. Otherwise you can get broken records back, if, for example, the join column also has
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# an id column. This will then overwrite the id column of the records coming back.
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def finding_with_ambiguous_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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private
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def create_record(attributes, &block)
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# Can't use Base.create because the foreign key may be a protected attribute.
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ensure_owner_is_not_new
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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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build_record(attributes, &block)
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end
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end
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end
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end
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end
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