Ruby on Rails

On 31 May 2012 11:53, Mauro <mrsanna1@gmail.com> wrote:
> On 31 May 2012 12:38, Colin Law <clanlaw@googlemail.com> wrote:
>> On 31 May 2012 09:40, Mauro <mrsanna1@gmail.com> wrote:
>>> Hello.
>>> I need an advice to find a solution on creating a new has_many
>>> :through association on a existing model.
>>> I have:
>>>
>>> Company
>>>  has_many :managements, :dependent => :destroy
>>>  has_many :managers, :through => :managements
>>>
>>> Manager
>>>  has_many :managements, :dependent => :destroy
>>>  has_many :companies, :through => :managements
>>>
>>> With the command
>>> link_to "Add manager", new_company_manager_url(@company), :class =>
>>> "btn", :remote => true
>>>
>>> I display the manager form, create a new manager associated to the
>>> company and create a new management.
>>> In manager controller:
>>>
>>> def create
>>>    @company = Company.find(params[:company_id])
>>>    @manager = Manager.new(params[:manager])
>>>    add_management
>>>    @manager.save
>>>    respond_with @manager
>>> end
>>>
>>> private
>>>  def add_management
>>>    profile = params[:manager][:profile]
>>>    profile.delete_if { |v| v.empty? }
>>>    profile.each do |prof|
>>>      @manager.managements.build(:profile => prof, :company => @company)
>>>    end
>>>  end
>>>
>>> If the manager exists I only need to create a new management, so in
>>> the manager new action I've put:
>>>
>>> def new
>>>    @company = Company.find(params[:company_id])
>>>    @manager = Manager.find_or_initialize_by_fiscal_code(params[:fiscal_code])
>>>    respond_with(@manager)
>>> end
>>>
>>> If the manager does not exists I create a new one and a new management
>>> like showed before.
>>> But, if the manager exists the form action is to update manager.
>>> I'm searching for a solution to only create a new management without
>>> updating manager.
>>
>> Why can't you do what you want in the update action?  If the details
>> of the manager record have not changed then the update will do
>> nothing.
>
> Uhm it sounds strange to me creating a new management association in
> the manager update action.
> I mean update only to to update manger attributes.
> Perhaps I'm wrong.

If you want to do it in the manager controller then update is the
correct action as changing the managements that it has is effectively
an update, even though this does not involve editing the manager
record itself. The other alternative is to put it in the create
action of the management controller. It is up to you which seems most
appropriate.

Colin

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