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UPD.
I need to display multiple records of a single model in a form.Then after updating some values I need to save all the records data at once..that is my form view should work like a spread sheet.
The requirement is, from one table I need to get data and populate all rows in a form. After that I have to edit some columns then and I should save all records of this model to database at a time.
Here is Railscast which presents how to edit multiple records in one form.