### Home Classes Methods

### In Files

- lib/merb-core/controller/mixins/render.rb

### Namespace

- MODULE Merb::RenderMixin::ClassMethods

### Methods

- ::included
- #_get_layout
- #_handle_options!
- #_template_for
- #_template_method_for
- #append_content
- #catch_content
- #clear_content
- #display
- #partial
- #render
- #throw_content
- #thrown_content?

### Included Modules

- Merb::ControllerExceptions

### Files

- CHANGELOG
- LICENSE
- README
- TODO

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# Merb::RenderMixin

### Public Class Methods

included(base) click to toggle source

#### Parameters

base<Module> | Module that is including RenderMixin (probably a controller)

@private

    # File lib/merb-core/controller/mixins/render.rb, line 9
    def self.included(base)
      base.extend(ClassMethods)
      base.class_eval do
        class_inheritable_accessor :_default_render_options
      end
    end

### Public Instance Methods

_get_layout(layout = nil) click to toggle source

Get the layout that should be used. The content-type will be appended to the layout unless the layout already contains a "." in it.

If no layout was passed in, this method will look for one with the same name as the controller, and finally one in "application.#{content_type}".

#### Parameters

layout<~to_s> | A layout, relative to the layout root. Defaults to nil.

#### Returns

String | The method name that corresponds to the found layout.

#### Raises

TemplateNotFound | If a layout was specified (either via layout in the class or by passing one in to this method), and not found. No error will be raised if no layout was specified, and the default layouts were not found.

:api: private

    # File lib/merb-core/controller/mixins/render.rb, line 373
    def _get_layout(layout = nil)
      return false if layout == false

      layout = layout.instance_of?(Symbol) && self.respond_to?(layout, true) ? send(layout) : layout
      layout = layout.to_s if layout

      # If a layout was provided, throw an error if it's not found
      if layout
        template_method, template_location =
          _template_for(layout, layout.index(".") ? nil : content_type, "layout")

        raise TemplateNotFound, "No layout found at #{template_location}" unless template_method
        template_method

      # If a layout was not provided, try the default locations
      else
        template, location = _template_for(controller_name, content_type, "layout")
        template, location = _template_for("application", content_type, "layout") unless template
        template
      end
    end

_handle_options!(opts) click to toggle source

Take the options hash and handle it as appropriate.

#### Parameters

opts<Hash> | The options hash that was passed into render.

#### Options

:status<~to_i> | The status of the response will be set to opts.to_i

#### Returns

Hash | The options hash that was passed in.

:api: private

    # File lib/merb-core/controller/mixins/render.rb, line 348
    def _handle_options!(opts)
      self.status = opts.delete(:status).to_i if opts[:status]
      headers["Location"] = opts.delete(:location) if opts[:location]
      opts
    end

_template_for(context, content_type, controller=nil, template=nil, locals=[]) click to toggle source

Iterate over the template roots in reverse order, and return the template and template location of the first match.

#### Parameters

context<Object> | The controller action or template (basename or absolute path).
content_type<~to_s> | The content type (like html or json).
controller<~to_s> | The name of the controller. Defaults to nil.
locals<Array> | A list of locals to assign from the args passed into the compiled template.

#### Options (opts)

:template<String> | The location of the template to use. Defaults to whatever matches this context, content_type and controller.

#### Returns

Array[Symbol, String] | A pair consisting of the template method and location.

:api: private

    # File lib/merb-core/controller/mixins/render.rb, line 414
    def _template_for(context, content_type, controller=nil, template=nil, locals=[])
      tmp = self.class._templates_for[[context, content_type, controller, template, locals]]
      return tmp if tmp

      template_method, template_location = nil, nil

      # absolute path to a template (:template => "/foo/bar")
      if template.is_a?(String) && template =~ %{^/}
        template_location = self._absolute_template_location(template, content_type)
        return [_template_method_for(template_location, locals), template_location]
      end

      self.class._template_roots.reverse_each do |root, template_meth|
        # :template => "foo/bar.html" where root / "foo/bar.html.*" exists
        if template
          template_location = root / self.send(template_meth, template, content_type, nil)
        # :layout => "foo" where root / "layouts" / "#{controller}.html.*" exists
        else
          template_location = root / self.send(template_meth, context, content_type, controller)
        end

        break if template_method = _template_method_for(template_location.to_s, locals)
      end

      # template_location is a Pathname
      ret = [template_method, template_location.to_s]
      unless Merb::Config[:reload_templates]
        self.class._templates_for[[context, content_type, controller, template, locals]] = ret
      end
      ret
    end

_template_method_for(template_location, locals) click to toggle source

Return the template method for a location, and check to make sure the current controller actually responds to the method.

#### Parameters

template_location<String> | The phyical path of the template
locals<Array> | A list of locals to assign from the args passed into the compiled template.

#### Returns

String | The method, if it exists. Otherwise return nil.

:api: private

    # File lib/merb-core/controller/mixins/render.rb, line 457
    def _template_method_for(template_location, locals)
      meth = Merb::Template.template_for(template_location, [], locals)
      meth && self.respond_to?(meth) ? meth : nil
    end

append_content(obj, string = nil, &block) click to toggle source

Called in templates to append content for later use. Works like throw_content.

@param [Object] obj

    Key used in the thrown_content hash.

@param [String] string

    Textual content. Default to nil.

@yield

    Evaluated with result concatenated to string.

@raise [ArgumentError]

    Neither string nor block given

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 523
    def append_content(obj, string = nil, &block)
      unless string || block_given?
        raise ArgumentError, "You must pass a block or a string into append_content"
      end
      @_caught_content[obj] = "" if @_caught_content[obj].nil?
      @_caught_content[obj] << string.to_s << (block_given? ? capture(&block) : "")
    end

catch_content(obj = :for_layout) click to toggle source

Called in templates to get at content thrown in another template. The results of rendering a template are automatically thrown into :for_layout, so catch_content or catch_content(:for_layout) can be used inside layouts to get the content rendered by the action template.

#### Parameters

obj<Object> | The key in the thrown_content hash. Defaults to :for_layout.

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 471
    def catch_content(obj = :for_layout)
      @_caught_content[obj] || ''
    end

clear_content(obj = :for_layout) click to toggle source

Called when renderers need to be sure that existing thrown content is cleared before throwing new content. This prevents double rendering of content when multiple templates are rendered after each other.

#### Parameters

obj<Object> | The key in the thrown_content hash. Defaults to :for_layout.

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 539
    def clear_content(obj = :for_layout)
      @_caught_content.delete(obj) unless @_caught_content[obj].nil?
    end

display(object, thing = nil, opts = {}) click to toggle source

Renders an object using to registered transform method based on the negotiated content-type, if a template does not exist. For instance, if the content-type is :json, Merb will first look for current_action.json.*. Failing that, it will run object.to_json.

#### Parameter

object<Object> | An object that responds_to? the transform method registered for the negotiated mime-type.
thing<String, Symbol> | The thing to attempt to render via render before calling the transform method on the object. Defaults to nil.
opts<Hash> | An options hash that will be used for rendering (passed on to render or serialization methods like to_json or to_xml)

#### Returns

String | The rendered template or if no template is found, the transformed object.

#### Raises

NotAcceptable | If there is no transform method for the specified mime-type or the object does not respond to the transform method.

#### Alternatives

A string in the second parameter will be interpreted as a template:

    display @object, "path/to/foo"
    #=> display @object, nil, :template => "path/to/foo"

A hash in the second parameters will be interpreted as opts:

    display @object, :layout => "zoo"
    #=> display @object, nil, :layout => "zoo"

If you need to pass extra parameters to serialization method, for instance, to exclude some of attributes or serialize associations, just pass options for it. For instance,

display @locations, :except => [:locatable_type, :locatable_id], :include => [:locatable]

serializes object with polymorphic association, not raw locatable_* attributes.

#### Options

:template a template to use for rendering :layout a layout to use for rendering :status the status code to return (defaults to 200) :location the value of the Location header

all other options options that will be pass to serialization method

    like #to_json or #to_xml

#### Notes

The transformed object will not be used in a layout unless a :layout is explicitly passed in the opts.

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 209
    def display(object, thing = nil, opts = {})
      template_opt = thing.is_a?(Hash) ? thing.delete(:template) : opts.delete(:template)

      case thing
      # display @object, "path/to/foo" means display @object, nil, :template => "path/to/foo"
      when String
        template_opt, thing = thing, nil
      # display @object, :template => "path/to/foo" means display @object, nil, :template => "path/to/foo"
      when Hash
        opts, thing = thing, nil
      end

      # Try to render without the object
      render(thing || action_name.to_sym, opts.merge(:template => template_opt))

    # If the render fails (i.e. a template was not found)
    rescue TemplateNotFound => e
      # Merge with class level default render options
      # @todo can we find a way to refactor this out so we don't have to do it everywhere?
      opts = self.class.default_render_options.merge(opts)

      # Figure out what to transform and raise NotAcceptable unless there's a transform method assigned
      transform = Merb.mime_transform_method(content_type)
      if !transform
        raise NotAcceptable, "#{e.message} and there was no transform method registered for #{content_type.inspect}"
      elsif !object.respond_to?(transform)
        raise NotAcceptable, "#{e.message} and your object does not respond to ##{transform}"
      end

      layout_opt = opts.delete(:layout)
      _handle_options!(opts)
      throw_content(:for_layout, opts.empty? ? object.send(transform) : object.send(transform, opts))

      meth, _ = _template_for(layout_opt, layout_opt.to_s.index(".") ? nil : content_type, "layout") if layout_opt
      meth ? send(meth) : catch_content(:for_layout)
    end

partial(template, opts={}) click to toggle source

Render a partial template.

#### Parameters

template<~to_s> | The path to the template, relative to the current controller or the template root; absolute path will work too. If the template contains a "/", Merb will search for it relative to the template root; otherwise, Merb will search for it relative to the current controller.
opts<Hash> | A hash of options (see below)

#### Options (opts)

:with<Object, Array> | An object or an array of objects that will be passed into the partial.
:as<~to_sym> | The local name of the :with Object inside of the partial.
:format<Symbol> | The mime format that you want the partial to be in (:js, :html, etc.)
others | A Hash object names and values that will be the local names and values inside the partial.

#### Examples

    partial :foo, :hello => @object

The "_foo" partial will be called, relative to the current controller, with a local variable of `hello` inside of it, assigned to @object.

    partial :bar, :with => ['one', 'two', 'three']

The "_bar" partial will be called once for each element of the array specified by :with for a total of three iterations. Each element of the array will be available in the partial via a local variable named `bar`. Additionally, there will be two extra local variables: `collection_index` and `collection_size`. `collection_index` is the index of the object currently referenced by `bar` in the collection passed to the partial. `collection_size` is the total size of the collection.

By default, the object specified by :with will be available through a local variable with the same name as the partial template. However, this can be changed using the :as option.

    partial :bar, :with => "one", :as => :number

In this case, "one" will be available in the partial through the local variable named `number`.

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 291
    def partial(template, opts={})

      # partial :foo becomes "#{controller_name}/_foo"
      # partial "foo/bar" becomes "foo/_bar"
      template = template.to_s
      if template =~ %{^/}
        template_path = File.dirname(template) / "_#{File.basename(template)}"
      else
        kontroller = (m = template.match(/.*(?=\/)/)) ? m[0] : controller_name
      end
      template = "_#{File.basename(template)}"

      # This handles no :with as well
      with = [opts.delete(:with)].flatten
      as = (opts.delete(:as) || template.match(%[(?:.*/)?_([^\./]*)])[1]).to_sym

      # Ensure that as is in the locals hash even if it isn't passed in here
      # so that it's included in the preamble.
      locals = opts.merge(:collection_index => -1, :collection_size => with.size, as => opts[as])
      template_method, template_location = _template_for(
        template,
        opts.delete(:format) || content_type,
        kontroller,
        template_path,
        locals.keys)

      # this handles an edge-case where the name of the partial is _foo.* and your opts
      # have :foo as a key.
      named_local = opts.key?(as)

      sent_template = with.map do |temp|
        locals[as] = temp unless named_local

        if template_method && self.respond_to?(template_method)
          locals[:collection_index] += 1
          send(template_method, locals)
        else
          raise TemplateNotFound, "Could not find template at #{template_location}.*"
        end
      end.join

      sent_template
    end

render(thing = nil, opts = {}) click to toggle source

Render the specified item, with the specified options.

#### Parameters

thing<String, Symbol, nil> | The thing to render. This will default to the current action
opts<Hash> | An options hash (see below)

#### Options (opts)

:format<Symbol> | A registered mime-type format
:template<String> | The path to the template relative to the template root
:status<~to_i> | The status to send to the client. Typically, this would be an integer (200), or a Merb status code (Accepted)

:layout<~to_s, FalseClass>

A layout to use instead of the default. This should be relative to the layout root. By default, the layout will be either the controller_name or application. If you want to use an alternative content-type than the one that the base template was rendered as, you will need to do :layout => "foo.#{content_type}" (i.e. "foo.json"). If you want to render without layout, use :layout => false. This overrides layout set by `layout` method.

#### Returns

String | The rendered template, including layout, if appropriate.

#### Raises

TemplateNotFound | There is no template for the specified location.

#### Alternatives

If you pass a Hash as the first parameter, it will be moved to opts and "thing" will be the current action

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 104
    def render(thing = nil, opts = {})
      # render :format => :xml means render nil, :format => :xml
      opts, thing = thing, nil if thing.is_a?(Hash)

      # Merge with class level default render options
      opts = self.class.default_render_options.merge(opts)

      # If you don't specify a thing to render, assume they want to render the current action
      thing ||= action_name.to_sym

      # Content negotiation
      self.content_type = opts[:format] if opts[:format]

      # Handle options (:status)
      _handle_options!(opts)

      # Do we have a template to try to render?
      if thing.is_a?(Symbol) || opts[:template]

        template_method, template_location =
          _template_for(thing, content_type, controller_name, opts[:template])

        # Raise an error if there's no template
        unless template_method && self.respond_to?(template_method)
          template_files = Merb::Template.template_extensions.map { |ext| "#{template_location}.#{ext}" }
          raise TemplateNotFound, "Oops! No template found. Merb was looking for #{template_files.join(', ')} " +
            "for content type '#{content_type}'. You might have mispelled the template or file name. " +
            "Registered template extensions: #{Merb::Template.template_extensions.join(', ')}. " +
            "If you use Haml or some other template plugin, make sure you required Merb plugin dependency " +
            "in your init file."
        end

        # Call the method in question and throw the content for later consumption by the layout
        throw_content(:for_layout, self.send(template_method))

      # Do we have a string to render?
      elsif thing.is_a?(String)

        # Throw it for later consumption by the layout
        throw_content(:for_layout, thing)
      end

      # If we find a layout, use it. Otherwise, just render the content thrown for layout.
      (layout = _get_layout(opts[:layout])) ? send(layout) : catch_content(:for_layout)
    end

throw_content(obj, string = nil, &block) click to toggle source

Called in templates to store up content for later use. Takes a string and/or a block. First, the string is evaluated, and then the block is captured using the capture() helper provided by the template languages. The two are concatenated together.

#### Parameters

obj<Object> | The key in the thrown_content hash.
string<String> | Textual content. Defaults to nil.
&block | A block to be evaluated and concatenated to string.

#### Raises

ArgumentError | Neither string nor block given.

#### Example

    throw_content(:foo, "Foo")
    catch_content(:foo) #=> "Foo"

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 503
    def throw_content(obj, string = nil, &block)
      unless string || block_given?
        raise ArgumentError, "You must pass a block or a string into throw_content"
      end
      @_caught_content[obj] = string.to_s << (block_given? ? capture(&block) : "")
    end

thrown_content?(obj = :for_layout) click to toggle source

Called in templates to test for the existence of previously thrown content.

#### Parameters

obj<Object> | The key in the thrown_content hash. Defaults to :for_layout.

:api: public

    # File lib/merb-core/controller/mixins/render.rb, line 481
    def thrown_content?(obj = :for_layout)
      @_caught_content.key?(obj)
    end

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