Action View Template

Namespace

Module

Class

Methods

Attributes

[R] format
[R] handler
[R] identifier
[R] locals
[R] original_encoding
[R] updated_at
[R] variable
[R] variant
[R] virtual_path

Class Public methods

finalize_compiled_template_methods()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 14
    def self.finalize_compiled_template_methods
      ActiveSupport::Deprecation.warn "ActionView::Template.finalize_compiled_template_methods is deprecated and has no effect"
    end
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finalize_compiled_template_methods=(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 18
    def self.finalize_compiled_template_methods=(_)
      ActiveSupport::Deprecation.warn "ActionView::Template.finalize_compiled_template_methods= is deprecated and has no effect"
    end
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new(source, identifier, handler, format: nil, variant: nil, locals: nil, virtual_path: nil, updated_at: nil)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 130
    def initialize(source, identifier, handler, format: nil, variant: nil, locals: nil, virtual_path: nil, updated_at: nil)
      unless locals
        ActiveSupport::Deprecation.warn "ActionView::Template#initialize requires a locals parameter"
        locals = []
      end

      @source            = source
      @identifier        = identifier
      @handler           = handler
      @compiled          = false
      @locals            = locals
      @virtual_path      = virtual_path

      @variable = if @virtual_path
        base = @virtual_path[-1] == "/" ? "" : ::File.basename(@virtual_path)
        base =~ /\A_?(.*?)(?:\.\w+)*\z/
        $1.to_sym
      end

      if updated_at
        ActiveSupport::Deprecation.warn "ActionView::Template#updated_at is deprecated"
        @updated_at        = updated_at
      else
        @updated_at        = Time.now
      end
      @format            = format
      @variant           = variant
      @compile_mutex     = Mutex.new
    end
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Instance Public methods

encode!()

This method is responsible for properly setting the encoding of the source. Until this point, we assume that the source is BINARY data. If no additional information is supplied, we assume the encoding is the same as Encoding.default_external.

The user can also specify the encoding via a comment on the first line of the template (# encoding: NAME-OF-ENCODING). This will work with any template engine, as we process out the encoding comment before passing the source on to the template engine, leaving a blank line in its stead.

📝 Source code 
# File actionview/lib/action_view/template.rb, line 217
    def encode!
      source = self.source

      return source unless source.encoding == Encoding::BINARY

      # Look for # encoding: *. If we find one, we'll encode the
      # String in that encoding, otherwise, we'll use the
      # default external encoding.
      if source.sub!(/\A#{ENCODING_FLAG}/, "")
        encoding = magic_encoding = $1
      else
        encoding = Encoding.default_external
      end

      # Tag the source with the default external encoding
      # or the encoding specified in the file
      source.force_encoding(encoding)

      # If the user didn't specify an encoding, and the handler
      # handles encodings, we simply pass the String as is to
      # the handler (with the default_external tag)
      if !magic_encoding && @handler.respond_to?(:handles_encoding?) && @handler.handles_encoding?
        source
      # Otherwise, if the String is valid in the encoding,
      # encode immediately to default_internal. This means
      # that if a handler doesn't handle encodings, it will
      # always get Strings in the default_internal
      elsif source.valid_encoding?
        source.encode!
      # Otherwise, since the String is invalid in the encoding
      # specified, raise an exception
      else
        raise WrongEncodingError.new(source, encoding)
      end
    end
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formats()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 165
              def formats; Array(format); end
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formats=(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 164
              def formats=(_); end
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inspect()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 199
    def inspect
      "#<#{self.class.name} #{short_identifier} locals=#{@locals.inspect}>"
    end
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local_assigns

Returns a hash with the defined local variables.

Given this sub template rendering:

<%= render "shared/header", { headline: "Welcome", person: person } %>

You can use local_assigns in the sub templates to access the local variables:

local_assigns[:headline] # => "Welcome"
📝 Source code 
# File actionview/lib/action_view/template.rb, line 114
    eager_autoload do
      autoload :Error
      autoload :RawFile
      autoload :Handlers
      autoload :HTML
      autoload :Inline
      autoload :Sources
      autoload :Text
      autoload :Types
    end
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locals=(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 163
              def locals=(_); end
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refresh(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 168
              def refresh(_); self; end
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render(view, locals, buffer = ActionView::OutputBuffer.new, &block)

Render a template. If the template was not compiled yet, it is done exactly before rendering.

This method is instrumented as “!render_template.action_view”. Notice that we use a bang in this instrumentation because you don't want to consume this in production. This is only slow if it's being listened to.

📝 Source code 
# File actionview/lib/action_view/template.rb, line 182
    def render(view, locals, buffer = ActionView::OutputBuffer.new, &block)
      instrument_render_template do
        compile!(view)
        view._run(method_name, self, locals, buffer, &block)
      end
    rescue => e
      handle_render_error(view, e)
    end
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short_identifier()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 195
    def short_identifier
      @short_identifier ||= defined?(Rails.root) ? identifier.sub("#{Rails.root}/", "") : identifier
    end
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source()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 203
    def source
      @source.to_s
    end
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supports_streaming?()

Returns whether the underlying handler supports streaming. If so, a streaming buffer may be passed when it starts rendering.

📝 Source code 
# File actionview/lib/action_view/template.rb, line 172
    def supports_streaming?
      handler.respond_to?(:supports_streaming?) && handler.supports_streaming?
    end
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type()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 191
    def type
      @type ||= Types[format]
    end
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variants()

📝 Source code 
# File actionview/lib/action_view/template.rb, line 167
              def variants; [variant]; end
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variants=(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 166
              def variants=(_); end
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virtual_path=(_)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 162
              def virtual_path=(_); end
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Instance Private methods

instrument(action, &block)

📝 Source code 
# File actionview/lib/action_view/template.rb, line 380
      def instrument(action, &block) # :doc:
        ActiveSupport::Notifications.instrument("#{action}.action_view", instrument_payload, &block)
      end
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