Syntax to create a dependent relation?

Rails
1

In my controller I have this:

def new
load_entity
@location = @entity.locations.build
@site = @location.build_site

respond_to do |format|
  format.html # new.html.erb
  format.xml  { render :xml => @location }
end

end

GET /locations/1/edit

def edit
load_entity
@location = @entity.locations(params[:id])
end

POST /locations

POST /locations.xml

def create
load_entity
@site = @location.build_site(params[:site])
@location = @entity.locations.build(params[:location].datebalk!)

When I return from my form I have this in params{}

{“user”=>{“userid”=>“authuser”,
“user_id”=>13466,
“user_name”=>“A. N. Authorized-User”},
“entity_id”=>“1”,
“commit”=>“Create”,
“authenticity_token”=>“a99e941c6191c6a0897165549bb2606328472187”,
“site”=>{“site_postal_code”=>" “,
“site_municipality”=>“Hamilton”,
“site_street_number”=>” “,
“site_region”=>“Ontario”,
“site_name”=>” “,
“site_country_code”=>“CA”,
“site_building_floor”=>” “,
“site_street_name”=>”",
“site_building_name”=>" “,
“site_building_unit_number”=>” “},
“location”=>{“location_description”=>” “,
“superseded_after__dteblk”=>”",
“effective_from__dteblk”=>"",
“location_type”=>“MAIN”,
“effective_from”=>"",
“superseded_after”=>""}}

What is the correct syntax to get the hash “site” and the hash
“location” contained within the hash “params”?