Flowdock
attributes=(new_attributes, guard_protected_attributes = true) public

Allows you to set all the attributes at once by passing in a hash with keys matching the attribute names (which again matches the column names).

If guard_protected_attributes is true (the default), then sensitive attributes can be protected from this form of mass-assignment by using the attr_protected macro. Or you can alternatively specify which attributes can be accessed with the attr_accessible macro. Then all the attributes not included in that won’t be allowed to be mass-assigned. 

  class User < ActiveRecord::Base
    attr_protected :is_admin
  end

  user = User.new
  user.attributes = { :username => 'Phusion', :is_admin => true }
  user.username   # => "Phusion"
  user.is_admin?  # => false

  user.send(:attributes=, { :username => 'Phusion', :is_admin => true }, false)
  user.is_admin?  # => true
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October 1, 2009
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Update attributes on mulitple models

Updates attributes on multiple models, saves each if validations pass. 

  def update_multiple
    @items = Item.find(params[:item_ids])
    @items.each do |item|
      item.attributes = params[:item].reject { |k,v| v.blank? }
    end
    if @items.all?(&:valid?)
      @items.each(&:save!)
      flash[:notice] = "Updated items!"
      redirect_to items_path
    else
      flash[:notice] = "Please enter valid data."
      render :action => 'edit_multiple'
    end
  end