为什么rails2.1中的link_to无效

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为什么rails2.1中的link_to无效5

<% for department in @departments %>
  <tr>
    <td><%=h department.Name %></td>
    <td><%=h department.Number %></td>
    <td><%=h department.ParentID %></td>
    <td><%=h department.Note %></td>
    <td><%= link_to 'Show', department_path(department.ID) %></td>
    <td><%= link_to 'Edit', edit_department_path(department.ID) %></td>
    <td><%= link_to 'Destroy',department_path(department.ID),  :confirm => 'Are you sure?', :method => :delete %></td>
  </tr>
<% end %>

这样的delete不起作用

<% for department in @departments %>
  <tr>
    <td><%=h department.Name %></td>
    <td><%=h department.Number %></td>
    <td><%=h department.ParentID %></td>
    <td><%=h department.Note %></td>
    <td><%= link_to 'Show', department %></td>
    <td><%= link_to 'Edit', edit_department_path(department) %></td>
    <td><%= link_to 'Destroy',department,  :confirm => 'Are you sure?', :method => :delete %></td>
  </tr>
<% end %>

这样三个都不行！

问:上面的代码行吗？   是不是rails2.1方式有变或者数据库字段不行！
rails2.1 RESTful routes 哪里有资料

问题补充：
map.resources :departments 已经设置！
就是http提交后没有处理就返回！
问题补充：
class DepartmentsController < ApplicationController
# GET /departments
# GET /departments.xml
def index
    @departments = Department.find(:all)
    respond_to do |format|
      format.html # index.html.erb
      format.xml { render

ml => @departments }
    end
end

# GET /departments/1
# GET /departments/1.xml
def show
    @department = Department.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml { render

ml => @department }
    end
end

# GET /departments/new
# GET /departments/new.xml
def new
    @department = Department.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml { render

ml => @department }
    end
end

# GET /departments/1/edit
def edit
    @department = Department.find(params[:id])
end

# POST /departments
# POST /departments.xml
def create
    @department = Department.new(params[:department])
    respond_to do |format|
      if @department.save
        flash[:notice] = 'Department was successfully created.'
        format.html { redirect_to(@department) }
        format.xml { render

ml => @department, :status => :created, :location => @department }
      else
        format.html { render :action => "new" }
        format.xml { render

ml => @department.errors, :status => :unprocessable_entity }
      end
    end
end

# PUT /departments/1
# PUT /departments/1.xml
def update
    @department = Department.find(params[:id])
    respond_to do |format|
      if @department.update_attributes(params[:department])
        flash[:notice] = 'Department was successfully updated.'
        format.html { redirect_to(@department) }
        format.xml { head

k }
      else
        format.html { render :action => "edit" }
        format.xml { render

ml => @department.errors, :status => :unprocessable_entity }
      end
    end
end

# DELETE /departments/1
# DELETE /departments/1.xml
def destroy
    @department = Department.find(params[:id])
    @department.destroy
    respond_to do |format|
      format.html { redirect_to(departments_url) }
      format.xml { head

k }
end
end

end

问题补充：
上面是controller 本人刚学谢谢热心的回答！受益匪浅
问题补充：
代码是用Scaffolding 生成的

Rails