158 lines
6.6 KiB
Ruby
158 lines
6.6 KiB
Ruby
module ActionView
|
|
# 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.erb" and pass the instance variable @account in as a local variable +account+ to
|
|
# the template for display.
|
|
#
|
|
# In another template for Advertiser#buy, we could have:
|
|
#
|
|
# <%= render :partial => "account", :locals => { :account => @buyer } %>
|
|
#
|
|
# <% for ad in @advertisements %>
|
|
# <%= render :partial => "ad", :locals => { :ad => ad } %>
|
|
# <% end %>
|
|
#
|
|
# This would first render "advertiser/_account.erb" with @buyer passed in as the local variable +account+, then render
|
|
# "advertiser/_ad.erb" and pass the local variable +ad+ to the template for display.
|
|
#
|
|
# == 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.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+.
|
|
#
|
|
# 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.erb" regardless of which controller this is being called from.
|
|
#
|
|
# == 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>
|
|
#
|
|
# 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: $<%= user.budget %>
|
|
# Title: <%= chief.name %>
|
|
# </div>
|
|
#
|
|
# As you can see, the <tt>:locals</tt> hash is shared between both the partial and its layout.
|
|
module Partials
|
|
private
|
|
def render_partial(partial_path, object_assigns = nil, local_assigns = {}) #:nodoc:
|
|
case partial_path
|
|
when String, Symbol, NilClass
|
|
# Render the template
|
|
ActionView::PartialTemplate.new(self, partial_path, object_assigns, local_assigns).render_template
|
|
when ActionView::Helpers::FormBuilder
|
|
builder_partial_path = partial_path.class.to_s.demodulize.underscore.sub(/_builder$/, '')
|
|
render_partial(builder_partial_path, object_assigns, (local_assigns || {}).merge(builder_partial_path.to_sym => partial_path))
|
|
when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::NamedScope::Scope
|
|
if partial_path.any?
|
|
collection = partial_path
|
|
render_partial_collection(nil, collection, nil, local_assigns)
|
|
else
|
|
""
|
|
end
|
|
else
|
|
render_partial(ActionController::RecordIdentifier.partial_path(partial_path, controller.class.controller_path), partial_path, local_assigns)
|
|
end
|
|
end
|
|
|
|
def render_partial_collection(partial_path, collection, partial_spacer_template = nil, local_assigns = {}) #:nodoc:
|
|
return " " if collection.empty?
|
|
|
|
local_assigns = local_assigns ? local_assigns.clone : {}
|
|
spacer = partial_spacer_template ? render(:partial => partial_spacer_template) : ''
|
|
|
|
if partial_path.nil?
|
|
render_partial_collection_with_unknown_partial_path(collection, local_assigns)
|
|
else
|
|
render_partial_collection_with_known_partial_path(collection, partial_path, local_assigns)
|
|
end.join(spacer)
|
|
end
|
|
|
|
def render_partial_collection_with_known_partial_path(collection, partial_path, local_assigns)
|
|
template = ActionView::PartialTemplate.new(self, partial_path, nil, local_assigns)
|
|
collection.map do |element|
|
|
template.render_member(element)
|
|
end
|
|
end
|
|
|
|
def render_partial_collection_with_unknown_partial_path(collection, local_assigns)
|
|
templates = Hash.new
|
|
i = 0
|
|
collection.map do |element|
|
|
partial_path = ActionController::RecordIdentifier.partial_path(element, controller.class.controller_path)
|
|
template = templates[partial_path] ||= ActionView::PartialTemplate.new(self, partial_path, nil, local_assigns)
|
|
template.counter = i
|
|
i += 1
|
|
template.render_member(element)
|
|
end
|
|
end
|
|
end
|
|
end
|