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Diffstat (limited to 'actionpack/lib/action_view/renderer/partial_renderer.rb')
| -rw-r--r-- | actionpack/lib/action_view/renderer/partial_renderer.rb | 478 |
1 files changed, 0 insertions, 478 deletions
diff --git a/actionpack/lib/action_view/renderer/partial_renderer.rb b/actionpack/lib/action_view/renderer/partial_renderer.rb deleted file mode 100644 index 43a88b0623..0000000000 --- a/actionpack/lib/action_view/renderer/partial_renderer.rb +++ /dev/null @@ -1,478 +0,0 @@ -require 'thread_safe' - -module ActionView - # = Action View Partials - # - # There's also a convenience method for rendering sub templates within the current controller that depends on a - # single object (we call this kind of sub templates for partials). It relies on the fact that partials should - # follow the naming convention of being prefixed with an underscore -- as to separate them from regular - # templates that could be rendered on their own. - # - # In a template for Advertiser#account: - # - # <%= render partial: "account" %> - # - # This would render "advertiser/_account.html.erb". - # - # In another template for Advertiser#buy, we could have: - # - # <%= render partial: "account", locals: { account: @buyer } %> - # - # <% @advertisements.each do |ad| %> - # <%= render partial: "ad", locals: { ad: ad } %> - # <% end %> - # - # This would first render "advertiser/_account.html.erb" with @buyer passed in as the local variable +account+, then - # render "advertiser/_ad.html.erb" and pass the local variable +ad+ to the template for display. - # - # == The :as and :object options - # - # By default <tt>ActionView::PartialRenderer</tt> doesn't have any local variables. - # The <tt>:object</tt> option can be used to pass an object to the partial. For instance: - # - # <%= render partial: "account", object: @buyer %> - # - # would provide the <tt>@buyer</tt> object to the partial, available under the local variable +account+ and is - # equivalent to: - # - # <%= render partial: "account", locals: { account: @buyer } %> - # - # With the <tt>:as</tt> option we can specify a different name for said local variable. For example, if we - # wanted it to be +user+ instead of +account+ we'd do: - # - # <%= render partial: "account", object: @buyer, as: 'user' %> - # - # This is equivalent to - # - # <%= render partial: "account", locals: { user: @buyer } %> - # - # == Rendering a collection of partials - # - # The example of partial use describes a familiar pattern where a template needs to iterate over an array and - # render a sub template for each of the elements. This pattern has been implemented as a single method that - # accepts an array and renders a partial by the same name as the elements contained within. So the three-lined - # example in "Using partials" can be rewritten with a single line: - # - # <%= render partial: "ad", collection: @advertisements %> - # - # This will render "advertiser/_ad.html.erb" and pass the local variable +ad+ to the template for display. An - # iteration counter will automatically be made available to the template with a name of the form - # +partial_name_counter+. In the case of the example above, the template would be fed +ad_counter+. - # - # The <tt>:as</tt> option may be used when rendering partials. - # - # You can specify a partial to be rendered between elements via the <tt>:spacer_template</tt> option. - # The following example will render <tt>advertiser/_ad_divider.html.erb</tt> between each ad partial: - # - # <%= render partial: "ad", collection: @advertisements, spacer_template: "ad_divider" %> - # - # If the given <tt>:collection</tt> is nil or empty, <tt>render</tt> will return nil. This will allow you - # to specify a text which will displayed instead by using this form: - # - # <%= render(partial: "ad", collection: @advertisements) || "There's no ad to be displayed" %> - # - # NOTE: Due to backwards compatibility concerns, the collection can't be one of hashes. Normally you'd also - # just keep domain objects, like Active Records, in there. - # - # == Rendering shared partials - # - # Two controllers can share a set of partials and render them like this: - # - # <%= render partial: "advertisement/ad", locals: { ad: @advertisement } %> - # - # This will render the partial "advertisement/_ad.html.erb" regardless of which controller this is being called from. - # - # == Rendering objects that respond to `to_partial_path` - # - # Instead of explicitly naming the location of a partial, you can also let PartialRenderer do the work - # and pick the proper path by checking `to_partial_path` method. - # - # # @account.to_partial_path returns 'accounts/account', so it can be used to replace: - # # <%= render partial: "accounts/account", locals: { account: @account} %> - # <%= render partial: @account %> - # - # # @posts is an array of Post instances, so every post record returns 'posts/post' on `to_partial_path`, - # # that's why we can replace: - # # <%= render partial: "posts/post", collection: @posts %> - # <%= render partial: @posts %> - # - # == Rendering the default case - # - # If you're not going to be using any of the options like collections or layouts, you can also use the short-hand - # defaults of render to render partials. Examples: - # - # # Instead of <%= render partial: "account" %> - # <%= render "account" %> - # - # # Instead of <%= render partial: "account", locals: { account: @buyer } %> - # <%= render "account", account: @buyer %> - # - # # @account.to_partial_path returns 'accounts/account', so it can be used to replace: - # # <%= render partial: "accounts/account", locals: { account: @account} %> - # <%= render @account %> - # - # # @posts is an array of Post instances, so every post record returns 'posts/post' on `to_partial_path`, - # # that's why we can replace: - # # <%= render partial: "posts/post", collection: @posts %> - # <%= render @posts %> - # - # == Rendering partials with layouts - # - # Partials can have their own layouts applied to them. These layouts are different than the ones that are - # specified globally for the entire action, but they work in a similar fashion. Imagine a list with two types - # of users: - # - # <%# app/views/users/index.html.erb &> - # Here's the administrator: - # <%= render partial: "user", layout: "administrator", locals: { user: administrator } %> - # - # Here's the editor: - # <%= render partial: "user", layout: "editor", locals: { user: editor } %> - # - # <%# app/views/users/_user.html.erb &> - # Name: <%= user.name %> - # - # <%# app/views/users/_administrator.html.erb &> - # <div id="administrator"> - # Budget: $<%= user.budget %> - # <%= yield %> - # </div> - # - # <%# app/views/users/_editor.html.erb &> - # <div id="editor"> - # Deadline: <%= user.deadline %> - # <%= yield %> - # </div> - # - # ...this will return: - # - # Here's the administrator: - # <div id="administrator"> - # Budget: $<%= user.budget %> - # Name: <%= user.name %> - # </div> - # - # Here's the editor: - # <div id="editor"> - # Deadline: <%= user.deadline %> - # Name: <%= user.name %> - # </div> - # - # If a collection is given, the layout will be rendered once for each item in - # the collection. Just think these two snippets have the same output: - # - # <%# app/views/users/_user.html.erb %> - # Name: <%= user.name %> - # - # <%# app/views/users/index.html.erb %> - # <%# This does not use layouts %> - # <ul> - # <% users.each do |user| -%> - # <li> - # <%= render partial: "user", locals: { user: user } %> - # </li> - # <% end -%> - # </ul> - # - # <%# app/views/users/_li_layout.html.erb %> - # <li> - # <%= yield %> - # </li> - # - # <%# app/views/users/index.html.erb %> - # <ul> - # <%= render partial: "user", layout: "li_layout", collection: users %> - # </ul> - # - # Given two users whose names are Alice and Bob, these snippets return: - # - # <ul> - # <li> - # Name: Alice - # </li> - # <li> - # Name: Bob - # </li> - # </ul> - # - # The current object being rendered, as well as the object_counter, will be - # available as local variables inside the layout template under the same names - # as available in the partial. - # - # You can also apply a layout to a block within any template: - # - # <%# app/views/users/_chief.html.erb &> - # <%= render(layout: "administrator", locals: { user: chief }) do %> - # Title: <%= chief.title %> - # <% end %> - # - # ...this will return: - # - # <div id="administrator"> - # Budget: $<%= user.budget %> - # Title: <%= chief.name %> - # </div> - # - # As you can see, the <tt>:locals</tt> hash is shared between both the partial and its layout. - # - # If you pass arguments to "yield" then this will be passed to the block. One way to use this is to pass - # an array to layout and treat it as an enumerable. - # - # <%# app/views/users/_user.html.erb &> - # <div class="user"> - # Budget: $<%= user.budget %> - # <%= yield user %> - # </div> - # - # <%# app/views/users/index.html.erb &> - # <%= render layout: @users do |user| %> - # Title: <%= user.title %> - # <% end %> - # - # This will render the layout for each user and yield to the block, passing the user, each time. - # - # You can also yield multiple times in one layout and use block arguments to differentiate the sections. - # - # <%# app/views/users/_user.html.erb &> - # <div class="user"> - # <%= yield user, :header %> - # Budget: $<%= user.budget %> - # <%= yield user, :footer %> - # </div> - # - # <%# app/views/users/index.html.erb &> - # <%= render layout: @users do |user, section| %> - # <%- case section when :header -%> - # Title: <%= user.title %> - # <%- when :footer -%> - # Deadline: <%= user.deadline %> - # <%- end -%> - # <% end %> - class PartialRenderer < AbstractRenderer - PREFIXED_PARTIAL_NAMES = ThreadSafe::Cache.new do |h, k| - h[k] = ThreadSafe::Cache.new - end - - def initialize(*) - super - @context_prefix = @lookup_context.prefixes.first - end - - def render(context, options, block) - setup(context, options, block) - identifier = (@template = find_partial) ? @template.identifier : @path - - @lookup_context.rendered_format ||= begin - if @template && @template.formats.present? - @template.formats.first - else - formats.first - end - end - - if @collection - instrument(:collection, :identifier => identifier || "collection", :count => @collection.size) do - render_collection - end - else - instrument(:partial, :identifier => identifier) do - render_partial - end - end - end - - def render_collection - return nil if @collection.blank? - - if @options.key?(:spacer_template) - spacer = find_template(@options[:spacer_template], @locals.keys).render(@view, @locals) - end - - result = @template ? collection_with_template : collection_without_template - result.join(spacer).html_safe - end - - def render_partial - view, locals, block = @view, @locals, @block - object, as = @object, @variable - - if !block && (layout = @options[:layout]) - layout = find_template(layout.to_s, @template_keys) - end - - object ||= locals[as] - locals[as] = object - - content = @template.render(view, locals) do |*name| - view._layout_for(*name, &block) - end - - content = layout.render(view, locals){ content } if layout - content - end - - private - - def setup(context, options, block) - @view = context - partial = options[:partial] - - @options = options - @locals = options[:locals] || {} - @block = block - @details = extract_details(options) - - prepend_formats(options[:formats]) - - if String === partial - @object = options[:object] - @path = partial - @collection = collection - else - @object = partial - - if @collection = collection_from_object || collection - paths = @collection_data = @collection.map { |o| partial_path(o) } - @path = paths.uniq.size == 1 ? paths.first : nil - else - @path = partial_path - end - end - - if as = options[:as] - raise_invalid_identifier(as) unless as.to_s =~ /\A[a-z_]\w*\z/ - as = as.to_sym - end - - if @path - @variable, @variable_counter = retrieve_variable(@path, as) - @template_keys = retrieve_template_keys - else - paths.map! { |path| retrieve_variable(path, as).unshift(path) } - end - - self - end - - def collection - if @options.key?(:collection) - collection = @options[:collection] - collection.respond_to?(:to_ary) ? collection.to_ary : [] - end - end - - def collection_from_object - @object.to_ary if @object.respond_to?(:to_ary) - end - - def find_partial - if path = @path - find_template(path, @template_keys) - end - end - - def find_template(path, locals) - prefixes = path.include?(?/) ? [] : @lookup_context.prefixes - @lookup_context.find_template(path, prefixes, true, locals, @details) - end - - def collection_with_template - view, locals, template = @view, @locals, @template - as, counter = @variable, @variable_counter - - if layout = @options[:layout] - layout = find_template(layout, @template_keys) - end - - index = -1 - @collection.map do |object| - locals[as] = object - locals[counter] = (index += 1) - - content = template.render(view, locals) - content = layout.render(view, locals) { content } if layout - content - end - end - - def collection_without_template - view, locals, collection_data = @view, @locals, @collection_data - cache = {} - keys = @locals.keys - - index = -1 - @collection.map do |object| - index += 1 - path, as, counter = collection_data[index] - - locals[as] = object - locals[counter] = index - - template = (cache[path] ||= find_template(path, keys + [as, counter])) - template.render(view, locals) - end - end - - def partial_path(object = @object) - object = object.to_model if object.respond_to?(:to_model) - - path = if object.respond_to?(:to_partial_path) - object.to_partial_path - else - raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.") - end - - if @view.prefix_partial_path_with_controller_namespace - prefixed_partial_names[path] ||= merge_prefix_into_object_path(@context_prefix, path.dup) - else - path - end - end - - def prefixed_partial_names - @prefixed_partial_names ||= PREFIXED_PARTIAL_NAMES[@context_prefix] - end - - def merge_prefix_into_object_path(prefix, object_path) - if prefix.include?(?/) && object_path.include?(?/) - prefixes = [] - prefix_array = File.dirname(prefix).split('/') - object_path_array = object_path.split('/')[0..-3] # skip model dir & partial - - prefix_array.each_with_index do |dir, index| - break if dir == object_path_array[index] - prefixes << dir - end - - (prefixes << object_path).join("/") - else - object_path - end - end - - def retrieve_template_keys - keys = @locals.keys - keys << @variable if @object || @collection - keys << @variable_counter if @collection - keys - end - - def retrieve_variable(path, as) - variable = as || begin - base = path[-1] == "/" ? "" : File.basename(path) - raise_invalid_identifier(path) unless base =~ /\A_?([a-z]\w*)(\.\w+)*\z/ - $1.to_sym - end - variable_counter = :"#{variable}_counter" if @collection - [variable, variable_counter] - end - - IDENTIFIER_ERROR_MESSAGE = "The partial name (%s) is not a valid Ruby identifier; " + - "make sure your partial name starts with a lowercase letter or underscore, " + - "and is followed by any combination of letters, numbers and underscores." - - def raise_invalid_identifier(path) - raise ArgumentError.new(IDENTIFIER_ERROR_MESSAGE % (path)) - end - end -end |