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404 lines
14 KiB
Ruby
404 lines
14 KiB
Ruby
require 'active_support/core_ext/object/blank'
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module ActionView
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# = Action View Partials
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#
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# There's also a convenience method for rendering sub templates within the current controller that depends on a
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# single object (we call this kind of sub templates for partials). It relies on the fact that partials should
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# follow the naming convention of being prefixed with an underscore -- as to separate them from regular
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# templates that could be rendered on their own.
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#
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# In a template for Advertiser#account:
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#
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# <%= render :partial => "account" %>
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#
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# This would render "advertiser/_account.html.erb".
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#
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# In another template for Advertiser#buy, we could have:
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#
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# <%= render :partial => "account", :locals => { :account => @buyer } %>
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#
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# <% @advertisements.each do |ad| %>
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# <%= render :partial => "ad", :locals => { :ad => ad } %>
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# <% end %>
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#
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# This would first render "advertiser/_account.html.erb" with @buyer passed in as the local variable +account+, then
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# render "advertiser/_ad.html.erb" and pass the local variable +ad+ to the template for display.
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#
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# == The :as and :object options
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#
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# By default <tt>ActionView::PartialRenderer</tt> doesn't have any local variables.
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# The <tt>:object</tt> option can be used to pass an object to the partial. For instance:
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#
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# <%= render :partial => "account", :object => @buyer %>
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#
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# would provide the +@buyer+ object to the partial, available under the local variable +account+ and is
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# equivalent to:
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#
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# <%= render :partial => "account", :locals => { :account => @buyer } %>
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#
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# With the <tt>:as</tt> option we can specify a different name for said local variable. For example, if we
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# wanted it to be +user+ instead of +account+ we'd do:
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#
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# <%= render :partial => "account", :object => @buyer, :as => 'user' %>
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#
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# This is equivalent to
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#
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# <%= render :partial => "account", :locals => { :user => @buyer } %>
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#
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# == Rendering a collection of partials
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#
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# The example of partial use describes a familiar pattern where a template needs to iterate over an array and
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# render a sub template for each of the elements. This pattern has been implemented as a single method that
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# accepts an array and renders a partial by the same name as the elements contained within. So the three-lined
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# example in "Using partials" can be rewritten with a single line:
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#
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# <%= render :partial => "ad", :collection => @advertisements %>
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#
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# This will render "advertiser/_ad.html.erb" and pass the local variable +ad+ to the template for display. An
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# iteration counter will automatically be made available to the template with a name of the form
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# +partial_name_counter+. In the case of the example above, the template would be fed +ad_counter+.
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#
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# The <tt>:as</tt> option may be used when rendering partials.
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#
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# You can specify a partial to be rendered between elements via the <tt>:spacer_template</tt> option.
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# The following example will render <tt>advertiser/_ad_divider.html.erb</tt> between each ad partial:
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#
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# <%= render :partial => "ad", :collection => @advertisements, :spacer_template => "ad_divider" %>
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#
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# If the given <tt>:collection</tt> is nil or empty, <tt>render</tt> will return nil. This will allow you
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# to specify a text which will displayed instead by using this form:
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#
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# <%= render(:partial => "ad", :collection => @advertisements) || "There's no ad to be displayed" %>
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#
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# NOTE: Due to backwards compatibility concerns, the collection can't be one of hashes. Normally you'd also
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# just keep domain objects, like Active Records, in there.
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#
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# == Rendering shared partials
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#
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# Two controllers can share a set of partials and render them like this:
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#
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# <%= render :partial => "advertisement/ad", :locals => { :ad => @advertisement } %>
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#
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# This will render the partial "advertisement/_ad.html.erb" regardless of which controller this is being called from.
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#
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# == Rendering objects with the RecordIdentifier
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#
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# Instead of explicitly naming the location of a partial, you can also let the RecordIdentifier do the work if
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# you're following its conventions for RecordIdentifier#partial_path. Examples:
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#
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# # @account is an Account instance, so it uses the RecordIdentifier to replace
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# # <%= render :partial => "accounts/account", :locals => { :account => @account} %>
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# <%= render :partial => @account %>
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#
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# # @posts is an array of Post instances, so it uses the RecordIdentifier to replace
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# # <%= render :partial => "posts/post", :collection => @posts %>
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# <%= render :partial => @posts %>
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#
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# == Rendering the default case
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#
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# If you're not going to be using any of the options like collections or layouts, you can also use the short-hand
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# defaults of render to render partials. Examples:
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#
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# # Instead of <%= render :partial => "account" %>
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# <%= render "account" %>
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#
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# # Instead of <%= render :partial => "account", :locals => { :account => @buyer } %>
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# <%= render "account", :account => @buyer %>
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#
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# # @account is an Account instance, so it uses the RecordIdentifier to replace
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# # <%= render :partial => "accounts/account", :locals => { :account => @account } %>
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# <%= render(@account) %>
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#
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# # @posts is an array of Post instances, so it uses the RecordIdentifier to replace
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# # <%= render :partial => "posts/post", :collection => @posts %>
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# <%= render(@posts) %>
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#
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# == Rendering partials with layouts
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#
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# Partials can have their own layouts applied to them. These layouts are different than the ones that are
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# specified globally for the entire action, but they work in a similar fashion. Imagine a list with two types
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# of users:
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#
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# <%# app/views/users/index.html.erb &>
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# Here's the administrator:
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# <%= render :partial => "user", :layout => "administrator", :locals => { :user => administrator } %>
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#
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# Here's the editor:
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# <%= render :partial => "user", :layout => "editor", :locals => { :user => editor } %>
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#
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# <%# app/views/users/_user.html.erb &>
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# Name: <%= user.name %>
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#
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# <%# app/views/users/_administrator.html.erb &>
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# <div id="administrator">
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# Budget: $<%= user.budget %>
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# <%= yield %>
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# </div>
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#
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# <%# app/views/users/_editor.html.erb &>
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# <div id="editor">
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# Deadline: <%= user.deadline %>
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# <%= yield %>
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# </div>
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#
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# ...this will return:
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#
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# Here's the administrator:
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# <div id="administrator">
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# Budget: $<%= user.budget %>
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# Name: <%= user.name %>
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# </div>
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#
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# Here's the editor:
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# <div id="editor">
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# Deadline: <%= user.deadline %>
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# Name: <%= user.name %>
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# </div>
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#
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# You can also apply a layout to a block within any template:
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#
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# <%# app/views/users/_chief.html.erb &>
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# <%= render(:layout => "administrator", :locals => { :user => chief }) do %>
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# Title: <%= chief.title %>
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# <% end %>
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#
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# ...this will return:
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#
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# <div id="administrator">
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# Budget: $<%= user.budget %>
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# Title: <%= chief.name %>
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# </div>
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#
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# As you can see, the <tt>:locals</tt> hash is shared between both the partial and its layout.
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#
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# If you pass arguments to "yield" then this will be passed to the block. One way to use this is to pass
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# an array to layout and treat it as an enumerable.
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#
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# <%# app/views/users/_user.html.erb &>
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# <div class="user">
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# Budget: $<%= user.budget %>
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# <%= yield user %>
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# </div>
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#
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# <%# app/views/users/index.html.erb &>
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# <%= render :layout => @users do |user| %>
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# Title: <%= user.title %>
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# <% end %>
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#
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# This will render the layout for each user and yield to the block, passing the user, each time.
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#
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# You can also yield multiple times in one layout and use block arguments to differentiate the sections.
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#
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# <%# app/views/users/_user.html.erb &>
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# <div class="user">
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# <%= yield user, :header %>
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# Budget: $<%= user.budget %>
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# <%= yield user, :footer %>
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# </div>
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#
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# <%# app/views/users/index.html.erb &>
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# <%= render :layout => @users do |user, section| %>
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# <%- case section when :header -%>
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# Title: <%= user.title %>
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# <%- when :footer -%>
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# Deadline: <%= user.deadline %>
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# <%- end -%>
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# <% end %>
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class PartialRenderer < AbstractRenderer #:nodoc:
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PARTIAL_NAMES = Hash.new { |h,k| h[k] = {} }
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def initialize(*)
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super
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@context_prefix = @lookup_context.prefixes.first
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@partial_names = PARTIAL_NAMES[@context_prefix]
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end
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def render(context, options, block)
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setup(context, options, block)
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identifier = (@template = find_partial) ? @template.identifier : @path
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if @collection
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instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do
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render_collection
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end
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else
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instrument(:partial, :identifier => identifier) do
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render_partial
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end
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end
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end
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def render_collection
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return nil if @collection.blank?
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if @options.key?(:spacer_template)
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spacer = find_template(@options[:spacer_template]).render(@view, @locals)
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end
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result = @template ? collection_with_template : collection_without_template
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result.join(spacer).html_safe
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end
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def render_partial
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locals, view, block = @locals, @view, @block
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object, as = @object, @variable
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if !block && (layout = @options[:layout])
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layout = find_template(layout)
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end
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object ||= locals[as]
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locals[as] = object
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content = @template.render(view, locals) do |*name|
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view._layout_for(*name, &block)
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end
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content = layout.render(view, locals){ content } if layout
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content
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end
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private
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def setup(context, options, block)
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@view = context
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partial = options[:partial]
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@options = options
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@locals = options[:locals] || {}
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@block = block
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@details = extract_details(options)
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if String === partial
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@object = options[:object]
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@path = partial
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@collection = collection
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else
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@object = partial
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if @collection = collection_from_object || collection
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paths = @collection_data = @collection.map { |o| partial_path(o) }
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@path = paths.uniq.size == 1 ? paths.first : nil
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else
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@path = partial_path
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end
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end
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if @path
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@variable, @variable_counter = retrieve_variable(@path)
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else
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paths.map! { |path| retrieve_variable(path).unshift(path) }
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end
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if String === partial && @variable.to_s !~ /^[a-z_][a-zA-Z_0-9]*$/
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raise ArgumentError.new("The partial name (#{partial}) is not a valid Ruby identifier; " +
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"make sure your partial name starts with a letter or underscore, " +
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"and is followed by any combinations of letters, numbers, or underscores.")
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end
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extract_format(@path, @details)
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self
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end
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def collection
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if @options.key?(:collection)
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collection = @options[:collection]
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collection.respond_to?(:to_ary) ? collection.to_ary : []
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end
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end
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def collection_from_object
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if @object.respond_to?(:to_ary)
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@object.to_ary
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end
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end
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def find_partial
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if path = @path
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locals = @locals.keys
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locals << @variable
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locals << @variable_counter if @collection
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find_template(path, locals)
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end
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end
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def find_template(path=@path, locals=@locals.keys)
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prefixes = path.include?(?/) ? [] : @lookup_context.prefixes
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@lookup_context.find_template(path, prefixes, true, locals, @details)
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end
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def collection_with_template
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segments, locals, template = [], @locals, @template
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as, counter = @variable, @variable_counter
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locals[counter] = -1
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@collection.each do |object|
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locals[counter] += 1
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locals[as] = object
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segments << template.render(@view, locals)
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end
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segments
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end
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def collection_without_template
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segments, locals, collection_data = [], @locals, @collection_data
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index, template, cache = -1, nil, {}
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keys = @locals.keys
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@collection.each_with_index do |object, i|
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path, *data = collection_data[i]
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template = (cache[path] ||= find_template(path, keys + data))
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locals[data[0]] = object
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locals[data[1]] = (index += 1)
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segments << template.render(@view, locals)
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end
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@template = template
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segments
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end
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def partial_path(object = @object)
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object = object.to_model if object.respond_to?(:to_model)
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path = if object.respond_to?(:to_partial_path)
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object.to_partial_path
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else
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klass = object.class
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if klass.respond_to?(:model_name)
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ActiveSupport::Deprecation.warn "ActiveModel-compatible objects whose classes return a #model_name that responds to #partial_path are deprecated. Please respond to #to_partial_path directly instead."
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klass.model_name.partial_path
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else
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raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object that returns a valid partial path.")
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end
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end
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@partial_names[path] ||= path.dup.tap do |object_path|
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merge_prefix_into_object_path(@context_prefix, object_path)
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end
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end
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def merge_prefix_into_object_path(prefix, object_path)
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if prefix.include?(?/) && object_path.include?(?/)
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overlap = []
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prefix_array = File.dirname(prefix).split('/')
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object_path_array = object_path.split('/')[0..-3] # skip model dir & partial
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prefix_array.each_with_index do |dir, index|
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overlap << dir if dir == object_path_array[index]
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end
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object_path.gsub!(/^#{overlap.join('/')}\//,'')
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object_path.insert(0, "#{File.dirname(prefix)}/")
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end
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end
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def retrieve_variable(path)
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variable = @options[:as].try(:to_sym) || path[%r'_?(\w+)(\.\w+)*$', 1].to_sym
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variable_counter = :"#{variable}_counter" if @collection
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[variable, variable_counter]
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end
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end
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end
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