[Rails] Re: save 2 value in diffrent field in one field at database

i edit my model file to be like this:

class Anggotum < ActiveRecord::Base
set_table_name "anggota"
attr_accessible :NP, :Nama, :Alamat, :TTL, :Telp, :Email, :Password,
:Waktu_Daftar, :Posisi, :Jenis_Kelamin
serialize :TTL
string "tempat"
date "tanggal"
#{':TTL'} << #{'tempat'] + #{'tanggal'}
end

and change the field in _form.html.rb file to be like this:
....
<div class="field">
<%= f.label :ttl %></td><td>
<%= f.label :":" %></td><td>
<%= f.text_field 'tempat' %>
<tr>
<td colspan="3" align="right">
<%= date_select 'tanggal', 'tanggal', {:start_year => 1950, :order
=> [:month, :day, :year]} %>
</div>
........

rails say this error

"NoMethodError in AnggotaController#index

undefined method `key?' for nil:NilClass"

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