gistfile1.txt

class Asset < AR
end

class Alert < AR
  belongs_to :asset
  has_many :logs
  accepts_nested_attributes_for :logs
end

class Log < AR
  belongs_to :asset
  belongs_to :alert
end


###### zee controller

class AlertsController < ApplicationController
  def resolve
    # TODO: only alerts that need resolution
    respond_with {
      @alert = @asset.alerts.find(params[:id])
      @alert.log_entries.build({:completed_at => Time.now})
    }
  end

  def update
    @alert = @asset.alerts.find(params[:id])
    @alert.update_attributes(params[:alert])
    respond_with(@alert, :location => asset_alerts_path(@asset.becomes(Asset)))
  end

end

##### zee view

<%= semantic_form_for([@asset.becomes(Asset), @alert.becomes(Alert)]) do |f| %>
  
  <%= f.inputs do %>
  
  <%= f.semantic_fields_for(:log_entries, @alert.log_entries.last) do |log| %>
    <%=log.input :completed_at, :as => :sane_datetime %>
    <%=log.input :content %>
  <% end %>
  
  <%= f.input :next_due %>
  
  <% end %>
  
  <%=f.buttons %>
<% end %>


##### what I post:
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"FOOBAR!!!!111one", "alert"=>{"log_attributes"=>{"0"=>{"completed_at(1s)"=>"11/01/2011", "completed_at(2s)"=>"12:00 AM", "content"=>"TESTERY!"}}, "next_due"=>"100"}, "commit"=>"Update Alert", "asset_id"=>"1", "id"=>"1"}


##### what I get:

 => #<Log id: 1, asset_id: nil, issue_id: nil, alert_id: 1, cost: nil, content: "TESTERY!", completed_at: "2011-11-01 07:00:00", created_at: "2011-11-01 20:25:15", updated_at: "2011-11-01 20:25:15"> 



Any way to set asset_id on the child created log?

idea1.rb

class Alert < AR
  belongs_to :asset
  has_many :logs
  accepts_nested_attributes_for :logs


  def log_entries_attributes=(attributes)
    # Manipulate attributes
    psuedocode do
      attributes.each { |a| a[:asset_id] = self.asset_id }
    end
    # This method could fail strangely if asset_id is set after log_entries_attributes
    # For example:
    #   alert.asset_id = 1
    #   alert.update :log_entries_attributes => [...], :asset_id => 2
    # In this case, I think that log entries will have asset_id = 1
    super attributes
  end
end

idea2.rb

class Alert < AR
  belongs_to :asset
  has_many :logs
  accepts_nested_attributes_for :logs


  def asset_id=(id)
    # TODO: Make sure that logs are auto-saved when we save...
    logs.each { |l| l.asset_id = id }
    # This might not work as expected if there are logs that are
    # created after asset_id is set
    super
  end

end