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https://github.com/rails/rails.git
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351 lines
12 KiB
Ruby
351 lines
12 KiB
Ruby
module ActionView
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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.erb" and pass the instance variable @account in as a local variable
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# +account+ to the template for display.
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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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# <% for ad in @advertisements %>
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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.erb" with @buyer passed in as the local variable +account+, then
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# render "advertiser/_ad.erb" and pass the local variable +ad+ to the template for display.
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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.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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# 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.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 => @buyer } %>
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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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module Partials
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extend ActiveSupport::Concern
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class PartialRenderer
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PARTIAL_NAMES = Hash.new {|h,k| h[k] = {} }
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TEMPLATES = Hash.new {|h,k| h[k] = {} }
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attr_reader :template
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def initialize(view_context, options, block)
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@view = view_context
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@partial_names = PARTIAL_NAMES[@view.controller.class]
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key = Thread.current[:format_locale_key]
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@templates = TEMPLATES[key] if key
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setup(options, block)
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end
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def setup(options, block)
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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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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
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paths = @collection_paths = @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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end
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def render
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identifier = ((@template = find_template) ? @template.identifier : @path)
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if @collection
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ActiveSupport::Notifications.instrument("action_view.render_collection",
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: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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content = ActiveSupport::Notifications.instrument("action_view.render_partial",
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:identifier => identifier) do
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render_partial
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end
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if !@block && (layout = @options[:layout])
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content = @view._render_layout(find_template(layout), @locals){ content }
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end
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content
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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 collection_with_template(template = @template)
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segments, locals, as = [], @locals, @options[:as] || template.variable_name
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counter_name = template.counter_name
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locals[counter_name] = -1
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@collection.each do |object|
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locals[counter_name] += 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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@template = template
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segments
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end
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def collection_without_template(collection_paths = @collection_paths)
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segments, locals, as = [], @locals, @options[:as]
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index, template = -1, nil
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@collection.each_with_index do |object, i|
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template = find_template(collection_paths[i])
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locals[template.counter_name] = (index += 1)
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locals[as || template.variable_name] = object
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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 render_partial(object = @object)
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locals, view = @locals, @view
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object ||= locals[template.variable_name]
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locals[@options[:as] || template.variable_name] = object
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template.render(view, locals) do |*name|
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view._layout_for(*name, &@block)
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end
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end
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private
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def collection
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if @object.respond_to?(:to_ary)
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@object
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elsif @options.key?(:collection)
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@options[:collection] || []
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end
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end
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def find_template(path = @path)
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unless @templates
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path && _find_template(path)
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else
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path && @templates[path] ||= _find_template(path)
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end
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end
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def _find_template(path)
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if controller = @view.controller
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prefix = controller.controller_path unless path.include?(?/)
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end
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@view.find(path, {:formats => @view.formats}, prefix, true)
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end
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def partial_path(object = @object)
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@partial_names[object.class] ||= begin
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object = object.to_model if object.respond_to?(:to_model)
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object.class.model_name.partial_path.dup.tap do |partial|
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path = @view.controller_path
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partial.insert(0, "#{File.dirname(path)}/") if path.include?(?/)
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end
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end
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end
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end
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def render_partial(options)
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_evaluate_assigns_and_ivars
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details = options[:_details]
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# Is this needed
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self.formats = details[:formats] if details
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renderer = PartialRenderer.new(self, options, nil)
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text = renderer.render
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options[:_template] = renderer.template
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text
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end
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def _render_partial(options, &block) #:nodoc:
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if defined? @renderer
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@renderer.setup(options, block)
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else
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@renderer = PartialRenderer.new(self, options, block)
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end
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@renderer.render
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end
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end
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end
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