Saving the End date

I have a problem in my database i have a table called members and have two fields start_date and end_date..fro开发者_高级运维m the form people can enter the start date and from there i want to add three months the start_date to give the end_date

e.g

@member.end_date = params[:start_date] + 3months 

can somebody please help me with this..Am using Rails3 by the way thanks

Assuming params[:start_date] is a Time or Date object, you've pretty much got it right with your example. You just need to use 3.months rather than 3months.

@member.end_date = params[:start_date] + 3.months

As an aside, this logic should probably live in the model (your code looks like you're doing this in the controller)...

class Member < ActiveRecord::Base

  before_save :set_end_date

  private

    def set_end_date
      self.end_date = self.start_date + 3.months
    end

end

You're just missing a dot in your syntax.

@member.end_date = params[:start_date] + 3.months

Here's an example in irb (rails console):

$ rails c
Loading development environment (Rails 3.0.3)
> start_date = Time.now
 => 2011-01-29 17:18:58 +0000 
> end_date = start_date + 3.months
 => 2011-04-29 17:18:58 +0100