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Until now, we ve been considering the use of partials that reside in the same directory as their parent template However, you can easily refer to partials that are in other directories, just by prefixing the directory name You still leave off the underscore, which has always felt a little weird Let s add a captcha partial to the bottom of the registration form from Listing 104, to help prevent spammers from invading our web application:
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terms = render :partial => 'terms' captcha = render :partial => 'shared/captcha' %p= submit_tag 'Register'
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Since the captcha partial is used in various different parts of the application, it makes sense to let it reside in a shared folder rather than any particular view folder However, you do have to be a little bit careful when you move existing template code into a shared partial It s quite possible to inadvertently craft a partial that depends implicitly on where it s rendered For example, take the case of the Rails-talk mailing list member with a troublesome partial defined in login/_loginhtmlhaml:
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- form_tag do %fieldset %label Username: = text_field_tag :username, params[:username] %br %label
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Password: = password_field_tag :password, params[:password] %br = submit_tag "Login"
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The login form submission worked when he rendered this partial as part of the login controller s login action ( the login page ), but not when it was included as part of the view for any other section of his website The problem is that form_tag (covered in the next chapter) normally takes an optional action parameter telling it where to post its information If you leave out the action, the form will post back to its current URL, which will vary for shared partials, depending on where they re being used from
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Partials inherit the method exposed to their parent templates implicitly That s why the form helpers used in the partials of Listings 104 and 106 work: They rely implicitly on an user method to be in scope I feel it s fine to use this implicit sharing in some cases, particularly when the partials are tightly bound to their parent templates It would be especially true in cases where the only reason you broke out a partial in the first place was to reduce the size and complexity of a particularly large template However, once you get into the practice of breaking out partial templates for reuse, depending on implicit context gets a lot more dicey That s why Rails supports the passing of locally scoped variables to partial templates, as in the following snippet:
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render 'shared/address', :form => form
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The values of the optional hash are converted into locally scoped variables (no @ sign) in the partial Listing 107 is a variation on the registration template This time we re using the version of form_for that yields a block parameter representing the form to its form helper methods We ll pass that form parameter on, too
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Listing 107 Simple user registration template passing form as local variable %h1 User Registration = form_for :user, :url => users_path do |form| = formerror_messages registration detailsaddressdemographics = render 'details', :form => form = render 'shared/address', :form => form %p= formsubmit 'Register'
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And finally, in Listing 108 we have the shared address form
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Listing 108 A simple shared address partial using local variable %fieldsetaddress %legend Address %p %label Street %br = formtext_area :street, :rows => 2, :cols => 40 %p %label City %br = formtext_field :city %p %label State %br = formtext_field :state, :size => 2 %p %label Zip %br = formtext_field :zip, :size => 15
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The form helper methods, which we ll cover in 11, have a variation in which they are called on the form variable yielded by the form_for method That is exactly what we passed on to these partials
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The local_assigns Hash If you need to check for the presence of a certain local variable in a partial, you need to do it by checking the local_assigns hash that is part of every template Using defined variable won t work because of the limitations of the rendering system
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