ruby on rails 3 - path helper for form_for tag with url options generates wrong url -

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i using form_for helper url option this:

<%= form_for  @security_user, url: security_users_manage_securities_path(@security_user),               html: { class: 'default', method: :put, id: 'security-default-form' } |f| %>

but 

security_users_manage_securities_path(@security_user)

returns me following string:

/security_users_manage_securities.105

when need following one:

/security_users_manage_securities/105

has un idea why id of @security_user parameter concatenated '.' instead '/'?

try use helper in singular mode, e.g.

security_users_manage_security_path(@security_user)

this should generate

/security_users_manage_securities/105

plural used when want url list , shouldn't pass params:

security_users_manage_securities_path

returns:

/security_users_manage_securities

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