Rails源代码分析（43）：ActionView Template (1)

Template 可以看作一个Wrapper,用来包装整个输出对象,包括如下几个:

Template

InlineTemplate < Template

PartialTemplate < Template

def initialize(view, path, use_full_path, locals = {}) @view = view @finder = @view.finder # Clear the forward slash at the beginning if exists @path = use_full_path ? path.sub(/^///, '') : path @view.first_render ||= @path @source = nil # Don't read the source until we know that it is required set_extension_and_file_name(use_full_path) @locals = locals || {} @handler = self.class.handler_class_for_extension(@extension).new(@view) end 

t@handler通过handler_class_for_extension类方法指定：

def self.handler_class_for_extension(extension) (extension && @@template_handlers[extension.to_sym]) || @@default_template_handlers end 

然后调用handler的render方法

def render prepare! @handler.render(self) end 

handler处理,而handler的注册如下

def self.register_template_handler(extension, klass) @@template_handlers[extension.to_sym] = klass TemplateFinder.update_extension_cache_for(extension.to_s) end def self.register_default_template_handler(extension, klass) register_template_handler(extension, klass) @@default_template_handlers = klass end register_default_template_handler :erb, TemplateHandlers::ERB register_template_handler :rjs, TemplateHandlers::RJS register_template_handler :builder, TemplateHandlers::Builder # TODO: Depreciate old template extensions register_template_handler :rhtml, TemplateHandlers::ERB register_template_handler :rxml, TemplateHandlers::Builder 

@@template_handlers = HashWithIndifferentAccess.new @@default_template_handlers = nil