ruby on rails 3 - RoR: Passing collection to partial won't work -

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i'm extending open source ror project , have following problem: original programmers passed collection partial this

<%= render partial: "option", collection: survey.options %>

and use in partial, e.g. this

<%= option.name %>

all works fine , understandable when reading guide http://guides.rubyonrails.org/layouts_and_rendering.html

a survey has answer_pairs (with string fields "answer1" , "answer2") , try pass them partial this

<%= render partial: "table_head", collection: survey.answer_pairs %>

and try use in partial _table_head.html.erb this

<td><b><%= answer_pair.answer2 %></b></td>

but rails gives me nameerror - undefined local variable or method `answer_pair' #<#:0x007fa07b9e0098>: app/views/surveys/_table_head.html.erb:1

could tell me why, please? when pass "as:" this

<%= render partial: "table_head", collection: survey.answer_pairs, as: :answer_pair %>

it recognizes first answer_pair of collection, nothing more. recognizes answer_pairs of collection, if like

<% survey.answer_pairs.each |pair| %>     <td><b><%= pair.answer2 %></b></td> <% end %>

any appreciated!

the auto generated variable named after template, not collection name. if access <td><b><%= table_head.answer2 %></b></td>, should work expect.


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