ruby on rails - How do I populate these fields? -

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if go website https://www.cameralends.com/?utm_source=hackernews can click various drop downs. i'd know how populate fields data?

e.g. there different camera models can choose etc...

i know using code like:

<% = a.select :categories, category.all.collect {|c| [c.name, c.id]}, :include_blank => true', :multiple => "multiple" %>

will display them, how populate categories initially?

if need add default set of values application, should use seeds.

see railscast learn more them.


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