html - Issue with Nested Form rendering -

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i have rails 4 app has form looks like:

<%= form_for @store, :html => {:multipart => true} |f| %>   <%= f.fields_for :products |product| %>     <%= render partial: "edit_product_fields", locals: {product:product} %>   <% end %>   <%= f.submit %> <% end %>

and edit_product_fields partial looks like:

<select>    <option value="textbook" <% if product.type_of == "textbook" %>selected<% end %>>textbook</option>    <option value="magazine" <% if product.type_of == "magazine" %>selected<% end %>>magazine</option>    <option value="book"     <% if product.type_of == "book"     %>selected<% end %>>book</option> </select>

when have code this, error:

undefined method `type_of' #<nestedform::builder:0x00000102304f78>

but if change render line (i made less explicit taking out partial:):

<%= render "edit_product_fields", locals: {product:product} %>

i error:

undefined local variable or method `product' #<#<class:0x0000010235a248>:0x0000010684b3c0>

in first code block, have builder object being stored product.

fortunately, builder provides object method can access actual object it's representing in form:

<select>    <option value="textbook" <%= 'selected' if product.object.type_of == "textbook" %>>textbook</option>    <option value="magazine" <%= 'selected' if product.object.type_of == "magazine" %>>magazine</option>    <option value="book"     <%= 'selected' if product.object.type_of == "book"     %>>book</option> </select>

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