Rails - Aug 2006 - update entry in a has_many relation

Hello all,
I want to upate a entry in a one to many relation, but is doesn''t work.
I can add or delete a specific entry, but I can''t update it.

Can anyone help me?

Here is the code:

class Person < ActiveRecord::Base
  has_many :materials
end

class Material < ActiveRecord::Base
  belongs_to: person
end

class PersonController < ApplicationController

  def update
      person = Person.find(@params["id"])
      person.name = @params["name"]
      first_material = person.materials.find(@params["material_id"])
      first_material.size = @params["material_size"]
      person.update
  end

  def add
      person = Person.new
      person.name = @params["name"]
      material = person.materials.find(@params["material_id"])
      person.materials.push(material)
      person.update
  end

  def delete_material
      person = Person.find(@params["id"])
      person.name = @params["name"]
      material = person.materials.find(@params["material_id"])
      person.materials.delete(material)
      person.update
  end

end

Thanks,
H

-- 
Posted via http://www.ruby-forum.com/.

Sorry, controller code is wrong.
Here is the correct one:

class PersonController < ApplicationController

  def update
      person = Person.find(@params["id"])
      person.name = @params["name"]
      first_material = person.materials.find(@params["material_id"])
      first_material.size = @params["material_size"]
      person.save
  end

  def add
      person = Person.new
      person.name = @params["name"]
      material = person.materials.find(@params["material_id"])
      person.materials.push(material)
      person.save
  end

  def delete_material
      person = Person.find(@params["id"])
      person.name = @params["name"]
      material = person.materials.find(@params["material_id"])
      person.materials.delete(material)
      person.save
  end

end

-- 
Posted via http://www.ruby-forum.com/.