hi all there are two tables Student and Batch in there model i have 
has_and_belongs_to_many :graduated_batches, :class_name => 'Batch', 
:join_table => 'batch_students' in Student table and 
 has_and_belongs_to_many :graduated_students, :class_name => 'Student', 
:join_table => 'batch_students' in Batch table 
which are connected to a table called "batch_students"
i have added a new column to batch_students table and i want to update the 
value in batch_students table. How can i update values in batch_students 
table where there is no model for that table so that i can update 
directly.how to update table which is in joins.

thanks in advance

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