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Class: ActionView::Base

Overview

Action View templates can be written in several ways. If the template file has a .erb extension, then it uses the erubi template system which can embed Ruby into an HTML document. If the template file has a .builder extension, then Jim Weirich’s Builder::XmlMarkup library is used.

ERB

You trigger ::ERB by using embeddings such as <% %>, <% -%>, and <%= %>. The <%= %> tag set is used when you want output. Consider the following loop for names:

<b>Names of all the people</b>
<% @people.each do |person| %>
  Name: <%= person.name %><br/>
<% end %>

The loop is set up in regular embedding tags <% %>, and the name is written using the output embedding tag <%= %>. Note that this is not just a usage suggestion. Regular output functions like print or puts won’t work with ::ERB templates. So this would be wrong:

<%# WRONG %>
Hi, Mr. <% puts "Frodo" %>

If you absolutely must write from within a function use concat.

When on a line that only contains whitespaces except for the tag, <% %> suppresses leading and trailing whitespace, including the trailing newline. <% %> and <%- -%> are the same. Note however that <%= %> and <%= -%> are different: only the latter removes trailing whitespaces.

Using sub templates

Using sub templates allows you to sidestep tedious replication and extract common display structures in shared templates. The classic example is the use of a header and footer (even though the Action Pack-way would be to use Layouts):

<%= render "shared/header" %>
Something really specific and terrific
<%= render "shared/footer" %>

As you see, we use the output embeddings for the render methods. The render call itself will just return a string holding the result of the rendering. The output embedding writes it to the current template.

But you don’t have to restrict yourself to static includes. Templates can share variables amongst themselves by using instance variables defined using the regular embedding tags. Like this:

<% @page_title = "A Wonderful Hello" %>
<%= render "shared/header" %>

Now the header can pick up on the @page_title variable and use it for outputting a title tag:

<title><%= @page_title %></title>

Passing local variables to sub templates

You can pass local variables to sub templates by using a hash with the variable names as keys and the objects as values:

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

These can now be accessed in shared/header with:

Headline: <%= headline %>
First name: <%= person.first_name %>

The local variables passed to sub templates can be accessed as a hash using the local_assigns hash. This lets you access the variables as:

Headline: <%= local_assigns[:headline] %>

This is useful in cases where you aren’t sure if the local variable has been assigned. Alternatively, you could also use defined? headline to first check if the variable has been assigned before using it.

Template caching

By default, ::Rails will compile each template to a method in order to render it. When you alter a template, ::Rails will check the file’s modification time and recompile it in development mode.

Builder

Builder templates are a more programmatic alternative to ::ERB. They are especially useful for generating XML content. An XmlMarkup object named xml is automatically made available to templates with a .builder extension.

Here are some basic examples:

xml.em("emphasized")                                 # => <em>emphasized</em>
xml.em { xml.b("emph & bold") }                      # => <em><b>emph &amp; bold</b></em>
xml.a("A Link", "href" => "http://onestepback.org")  # => <a href="http://onestepback.org">A Link</a>
xml.target("name" => "compile", "option" => "fast")  # => <target option="fast" name="compile"\>
                                                     # NOTE: order of attributes is not specified.

Any method with a block will be treated as an XML markup tag with nested markup in the block. For example, the following:

xml.div do
  xml.h1(@person.name)
  xml.p(@person.bio)
end

would produce something like:

<div>
  <h1>David Heinemeier Hansson</h1>
  <p>A product of Danish Design during the Winter of '79...</p>
</div>

Here is a full-length RSS example actually used on Basecamp:

xml.rss("version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/") do
  xml.channel do
    xml.title(@feed_title)
    xml.link(@url)
    xml.description "Basecamp: Recent items"
    xml.language "en-us"
    xml.ttl "40"

    @recent_items.each do |item|
      xml.item do
        xml.title(item_title(item))
        xml.description(item_description(item)) if item_description(item)
        xml.pubDate(item_pubDate(item))
        xml.guid(@person.firm..url + @recent_items.url(item))
        xml.link(@person.firm..url + @recent_items.url(item))

        xml.tag!("dc:creator", item.author_name) if item_has_creator?(item)
      end
    end
  end
end

For more information on Builder please consult the source code.

Constant Summary

::ERB::Util - Included

HTML_ESCAPE, HTML_ESCAPE_ONCE_REGEXP, JSON_ESCAPE, JSON_ESCAPE_REGEXP, TAG_NAME_FOLLOWING_REGEXP, TAG_NAME_REPLACEMENT_CHAR, TAG_NAME_START_REGEXP, TAG_NAME_START_REGEXP_SET

Helpers::AssetUrlHelper - Included

ASSET_EXTENSIONS, ASSET_PUBLIC_DIRECTORIES, URI_REGEXP

Helpers::TagHelper - Included

ARIA_PREFIXES, BOOLEAN_ATTRIBUTES, DATA_PREFIXES, PRE_CONTENT_STRINGS, TAG_TYPES

Helpers::DateHelper - Included

MINUTES_IN_QUARTER_YEAR, MINUTES_IN_THREE_QUARTERS_YEAR, MINUTES_IN_YEAR

Helpers::UrlHelper - Included

BUTTON_TAG_METHOD_VERBS, STRINGIFIED_COMMON_METHODS

RecordIdentifier - Included

JOIN, NEW

Helpers::JavaScriptHelper - Included

JS_ESCAPE_MAP

Class Attribute Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Helpers::RenderingHelper - Included

#_layout_for

Overwrites _layout_for in the context object so it supports the case a block is passed to a partial.

#render

Returns the result of a render that’s dictated by the options hash.

Helpers::NumberHelper - Included

#number_to_currency

Formats a number into a currency string (e.g., $13.65).

#number_to_human

Pretty prints (formats and approximates) a number in a way it is more readable by humans (e.g.: 1200000000 becomes “1.2 Billion”).

#number_to_human_size

Formats the bytes in number into a more understandable representation (e.g., giving it 1500 yields 1.46 KB).

#number_to_percentage

Formats a number as a percentage string (e.g., 65%).

#number_to_phone

Formats a number into a phone number (US by default e.g., (555) 123-9876).

#number_with_delimiter

Formats a number with grouped thousands using delimiter (e.g., 12,324).

#number_with_precision

Formats a number with the specified level of :precision (e.g., 112.32 has a precision of 2 if :significant is false, and 5 if :significant is true).

Helpers::JavaScriptHelper - Included

#escape_javascript

Escapes carriage returns and single and double quotes for JavaScript segments.

#j
#javascript_tag

Returns a JavaScript tag with the content inside.

Helpers::FormOptionsHelper - Included

#collection_check_boxes

Returns check box tags for the collection of existing return values of method for object‘s class.

#collection_radio_buttons

Returns radio button tags for the collection of existing return values of method for object‘s class.

#collection_select

Returns <select> and <option> tags for the collection of existing return values of method for object‘s class.

#grouped_collection_select

Returns <select>, <optgroup> and <option> tags for the collection of existing return values of method for object‘s class.

#grouped_options_for_select

Returns a string of <option> tags, like options_for_select, but wraps them with <optgroup> tags:

#option_groups_from_collection_for_select

Returns a string of <option> tags, like options_from_collection_for_select, but groups them by <optgroup> tags based on the object relationships of the arguments.

#options_for_select

Accepts a container (hash, array, enumerable, your type) and returns a string of option tags.

#options_from_collection_for_select

Returns a string of option tags that have been compiled by iterating over the collection and assigning the result of a call to the value_method as the option value and the text_method as the option text.

#select

Create a select tag and a series of contained option tags for the provided object and method.

#time_zone_options_for_select

Returns a string of option tags for pretty much any time zone in the world.

#time_zone_select

Returns select and option tags for the given object and method, using #time_zone_options_for_select to generate the list of option tags.

Helpers::FormHelper - Included

#check_box

Returns a checkbox tag tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#color_field

Returns a text_field of type “color”.

#date_field

Returns a text_field of type “date”.

#datetime_field

Returns a text_field of type “datetime-local”.

#datetime_local_field
#email_field

Returns a text_field of type “email”.

#fields

Scopes input fields with either an explicit scope or model.

#fields_for

Creates a scope around a specific model object like form_for, but doesn’t create the form tags themselves.

#file_field

Returns a file upload input tag tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#form_for

Creates a form that allows the user to create or update the attributes of a specific model object.

#form_with

Creates a form tag based on mixing URLs, scopes, or models.

#hidden_field

Returns a hidden input tag tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#label

Returns a label tag tailored for labelling an input field for a specified attribute (identified by method) on an object assigned to the template (identified by object).

#month_field

Returns a text_field of type “month”.

#number_field

Returns an input tag of type “number”.

#password_field

Returns an input tag of the “password” type tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#phone_field
#radio_button

Returns a radio button tag for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#range_field

Returns an input tag of type “range”.

#search_field

Returns an input of type “search” for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object_name).

#telephone_field

Returns a text_field of type “tel”.

#text_area

Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#text_field

Returns an input tag of the “text” type tailored for accessing a specified attribute (identified by method) on an object assigned to the template (identified by object).

#time_field

Returns a text_field of type “time”.

#url_field

Returns a text_field of type “url”.

#week_field

Returns a text_field of type “week”.

RecordIdentifier - Included

#dom_class

The DOM class convention is to use the singular form of an object or class.

#dom_id

The DOM id convention is to use the singular form of an object or class with the id following an underscore.

#record_key_for_dom_id

Returns a string representation of the key attribute(s) that is suitable for use in an HTML DOM id.

Helpers::FormTagHelper - Included

#button_tag

Creates a button element that defines a submit button, reset button or a generic button which can be used in JavaScript, for example.

#check_box_tag

Creates a check box form input tag.

#color_field_tag

Creates a text field of type “color”.

#date_field_tag

Creates a text field of type “date”.

#datetime_field_tag

Creates a text field of type “datetime-local”.

#datetime_local_field_tag
#email_field_tag

Creates a text field of type “email”.

#field_set_tag

Creates a field set for grouping HTML form elements.

#file_field_tag

Creates a file upload field.

#form_tag

Starts a form tag that points the action to a URL configured with url_for_options just like ActionController::Base#url_for.

#hidden_field_tag

Creates a hidden form input field used to transmit data that would be lost due to HTTP’s statelessness or data that should be hidden from the user.

#image_submit_tag

Displays an image which when clicked will submit the form.

#label_tag

Creates a label element.

#month_field_tag

Creates a text field of type “month”.

#number_field_tag

Creates a number field.

#password_field_tag

Creates a password field, a masked text field that will hide the users input behind a mask character.

#phone_field_tag
#radio_button_tag

Creates a radio button; use groups of radio buttons named the same to allow users to select from a group of options.

#range_field_tag

Creates a range form element.

#search_field_tag

Creates a text field of type “search”.

#select_tag

Creates a dropdown selection box, or if the :multiple option is set to true, a multiple choice selection box.

#submit_tag

Creates a submit button with the text value as the caption.

#telephone_field_tag

Creates a text field of type “tel”.

#text_area_tag

Creates a text input area; use a textarea for longer text inputs such as blog posts or descriptions.

#text_field_tag

Creates a standard text field; use these text fields to input smaller chunks of text like a username or a search query.

#time_field_tag

Creates a text field of type “time”.

#url_field_tag

Creates a text field of type “url”.

#utf8_enforcer_tag

Creates the hidden UTF8 enforcer tag.

#week_field_tag

Creates a text field of type “week”.

Helpers::TextHelper - Included

#concat

The preferred method of outputting text in your views is to use the <%= “text” %> eRuby syntax.

#current_cycle

Returns the current cycle string after a cycle has been started.

#cycle

Creates a Cycle object whose to_s method cycles through elements of an array every time it is called.

#excerpt

Extracts an excerpt from text that matches the first instance of phrase.

#highlight

Highlights one or more phrases everywhere in text by inserting it into a :highlighter string.

#pluralize

Attempts to pluralize the singular word unless count is 1.

#reset_cycle

Resets a cycle so that it starts from the first element the next time it is called.

#safe_concat,
#simple_format

Returns text transformed into HTML using simple formatting rules.

#truncate

Truncates a given text after a given :length if text is longer than :length (defaults to 30).

#word_wrap

Wraps the text into lines no longer than line_width width.

Helpers::SanitizeHelper - Included

#sanitize

Sanitizes HTML input, stripping all but known-safe tags and attributes.

#sanitize_css

Sanitizes a block of CSS code.

#strip_links

Strips all link tags from html leaving just the link text.

#strip_tags

Strips all HTML tags from html, including comments and special characters.

Helpers::UrlHelper - Included

#button_to

Generates a form containing a single button that submits to the URL created by the set of options.

#link_to

Creates an anchor element of the given name using a URL created by the set of options.

#link_to_if

Creates a link tag of the given name using a URL created by the set of options if condition is true, otherwise only the name is returned.

#link_to_unless

Creates a link tag of the given name using a URL created by the set of options unless condition is true, in which case only the name is returned.

#link_to_unless_current

Creates a link tag of the given name using a URL created by the set of options unless the current request ::URI is the same as the links, in which case only the name is returned (or the given block is yielded, if one exists).

#mail_to

Creates a mailto link tag to the specified email_address, which is also used as the name of the link unless name is specified.

#phone_to

Creates a TEL anchor link tag to the specified phone_number, which is also used as the name of the link unless name is specified.

#sms_to

Creates an SMS anchor link tag to the specified phone_number, which is also used as the name of the link unless name is specified.

Helpers::DateHelper - Included

#date_select

Returns a set of select tags (one for year, month, and day) pre-selected for accessing a specified date-based attribute (identified by method) on an object assigned to the template (identified by object).

#datetime_select

Returns a set of select tags (one for year, month, day, hour, and minute) pre-selected for accessing a specified datetime-based attribute (identified by method) on an object assigned to the template (identified by object).

#distance_of_time_in_words

Reports the approximate distance in time between two ::Time, ::Date or ::DateTime objects or integers as seconds.

#distance_of_time_in_words_to_now
#select_date

Returns a set of HTML select-tags (one for year, month, and day) pre-selected with the date.

#select_datetime

Returns a set of HTML select-tags (one for year, month, day, hour, minute, and second) pre-selected with the datetime.

#select_day

Returns a select tag with options for each of the days 1 through 31 with the current day selected.

#select_hour

Returns a select tag with options for each of the hours 0 through 23 with the current hour selected.

#select_minute

Returns a select tag with options for each of the minutes 0 through 59 with the current minute selected.

#select_month

Returns a select tag with options for each of the months January through December with the current month selected.

#select_second

Returns a select tag with options for each of the seconds 0 through 59 with the current second selected.

#select_time

Returns a set of HTML select-tags (one for hour and minute).

#select_year

Returns a select tag with options for each of the five years on each side of the current, which is selected.

#time_ago_in_words

Like distance_of_time_in_words, but where to_time is fixed to Time.now.

#time_select

Returns a set of select tags (one for hour, minute and optionally second) pre-selected for accessing a specified time-based attribute (identified by method) on an object assigned to the template (identified by object).

#time_tag

Returns an HTML time tag for the given date or time.

Helpers::AssetTagHelper - Included

#audio_tag

Returns an HTML audio tag for the sources.

#auto_discovery_link_tag

Returns a link tag that browsers and feed readers can use to auto-detect an RSS, Atom, or JSON feed.

#favicon_link_tag

Returns a link tag for a favicon managed by the asset pipeline.

#image_tag

Returns an HTML image tag for the source.

#javascript_include_tag

Returns an HTML script tag for each of the sources provided.

#preload_link_tag

Returns a link tag that browsers can use to preload the source.

#stylesheet_link_tag

Returns a stylesheet link tag for the sources specified as arguments.

#video_tag

Returns an HTML video tag for the sources.

Helpers::TagHelper - Included

#cdata_section

Returns a CDATA section with the given content.

#class_names
#content_tag

Returns an HTML block tag of type name surrounding the content.

#escape_once

Returns an escaped version of html without affecting existing escaped entities.

#tag

Returns an HTML tag.

#token_list

Returns a string of tokens built from args.

Helpers::CaptureHelper - Included

#capture

The capture method extracts part of a template as a ::String object.

#content_for

Calling content_for stores a block of markup in an identifier for later use.

#content_for?

content_for? checks whether any content has been captured yet using content_for.

#provide

The same as content_for but when used with streaming flushes straight back to the layout.

Helpers::AssetUrlHelper - Included

#asset_path

This is the entry point for all assets.

#asset_url

Computes the full URL to an asset in the public directory.

#audio_path

Computes the path to an audio asset in the public audios directory.

#audio_url

Computes the full URL to an audio asset in the public audios directory.

#compute_asset_extname

Compute extname to append to asset path.

#compute_asset_host

Pick an asset host for this source.

#compute_asset_path

Computes asset path to public directory.

#font_path

Computes the path to a font asset.

#font_url

Computes the full URL to a font asset.

#image_path

Computes the path to an image asset.

#image_url

Computes the full URL to an image asset.

#javascript_path

Computes the path to a JavaScript asset in the public javascripts directory.

#javascript_url

Computes the full URL to a JavaScript asset in the public javascripts directory.

#path_to_asset
#path_to_audio
#path_to_font
#path_to_image
#path_to_javascript
#path_to_stylesheet
#path_to_video
#public_compute_asset_path
#stylesheet_path

Computes the path to a stylesheet asset in the public stylesheets directory.

#stylesheet_url

Computes the full URL to a stylesheet asset in the public stylesheets directory.

#url_to_asset
#url_to_audio
#url_to_font
#url_to_image
#url_to_javascript
#url_to_stylesheet
#url_to_video
#video_path

Computes the path to a video asset in the public videos directory.

#video_url

Computes the full URL to a video asset in the public videos directory.

::ActiveSupport::Benchmarkable - Included

#benchmark

Allows you to measure the execution time of a block in a template and records the result to the log.

Context - Included

#_layout_for

Encapsulates the interaction with the view flow so it returns the correct buffer on yield.

#_prepare_context

Prepares the context by setting the appropriate instance variables.

Class Attribute Details

._routes (rw)

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# File 'actionview/lib/action_view/base.rb', line 168

class_attribute :_routes

._routes?Boolean (rw)

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# File 'actionview/lib/action_view/base.rb', line 168

class_attribute :_routes

.annotate_rendered_view_with_filenames (rw) Also known as: #annotate_rendered_view_with_filenames

Annotate rendered view with file names

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# File 'actionview/lib/action_view/base.rb', line 166

cattr_accessor :annotate_rendered_view_with_filenames, default: false

.automatically_disable_submit_tag (rw) Also known as: #automatically_disable_submit_tag

Specify whether submit_tag should automatically disable on click

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# File 'actionview/lib/action_view/base.rb', line 163

cattr_accessor :automatically_disable_submit_tag, default: true

.cache_template_loading (rw)

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# File 'actionview/lib/action_view/base.rb', line 174

def cache_template_loading
  ActionView::Resolver.caching?
end

.cache_template_loading=(value) (rw)

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# File 'actionview/lib/action_view/base.rb', line 178

def cache_template_loading=(value)
  ActionView::Resolver.caching = value
end

.default_formats (rw) Also known as: #default_formats

Specify default_formats that can be rendered.

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# File 'actionview/lib/action_view/base.rb', line 157

cattr_accessor :default_formats

.field_error_proc (rw) Also known as: #field_error_proc

Specify the proc used to decorate input tags that refer to attributes with errors.

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# File 'actionview/lib/action_view/base.rb', line 145

cattr_accessor :field_error_proc, default: Proc.new { |html_tag, instance| "<div class=\"field_with_errors\">#{html_tag}</div>".html_safe }

.logger (rw)

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# File 'actionview/lib/action_view/base.rb', line 169

class_attribute :logger

.logger?Boolean (rw)

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# File 'actionview/lib/action_view/base.rb', line 169

class_attribute :logger

.prefix_partial_path_with_controller_namespace (rw)

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# File 'actionview/lib/action_view/base.rb', line 154

class_attribute :prefix_partial_path_with_controller_namespace, default: true

.prefix_partial_path_with_controller_namespace?Boolean (rw)

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# File 'actionview/lib/action_view/base.rb', line 154

class_attribute :prefix_partial_path_with_controller_namespace, default: true

.raise_on_missing_translations (rw) Also known as: #raise_on_missing_translations

Specify whether an error should be raised for missing translations

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# File 'actionview/lib/action_view/base.rb', line 160

cattr_accessor :raise_on_missing_translations, default: false

.streaming_completion_on_exception (rw) Also known as: #streaming_completion_on_exception

How to complete the streaming when an exception occurs. This is our best guess: first try to close the attribute, then the tag.

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# File 'actionview/lib/action_view/base.rb', line 149

cattr_accessor :streaming_completion_on_exception, default: %("><script>window.location = "/500.html"</script></html>)

Class Method Details

.empty

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# File 'actionview/lib/action_view/base.rb', line 216

def self.empty
  with_view_paths([])
end

.with_context(context, assigns = {}, controller = nil)

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# File 'actionview/lib/action_view/base.rb', line 224

def self.with_context(context, assigns = {}, controller = nil)
  new context, assigns, controller
end

.with_view_paths(view_paths, assigns = {}, controller = nil)

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# File 'actionview/lib/action_view/base.rb', line 220

def self.with_view_paths(view_paths, assigns = {}, controller = nil)
  with_context ActionView::LookupContext.new(view_paths), assigns, controller
end

Instance Attribute Details

#_routes (rw)

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# File 'actionview/lib/action_view/base.rb', line 168

class_attribute :_routes

#_routes?Boolean (rw)

[ GitHub ]

  
# File 'actionview/lib/action_view/base.rb', line 168

class_attribute :_routes

#annotate_rendered_view_with_filenames (rw)

[ GitHub ]

  
# File 'actionview/lib/action_view/base.rb', line 166

cattr_accessor :annotate_rendered_view_with_filenames, default: false

#assigns (rw)

[ GitHub ]

  
# File 'actionview/lib/action_view/base.rb', line 206

attr_internal :config, :assigns

#automatically_disable_submit_tag (rw)

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# File 'actionview/lib/action_view/base.rb', line 163

cattr_accessor :automatically_disable_submit_tag, default: true

#config (rw)

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# File 'actionview/lib/action_view/base.rb', line 206

attr_internal :config, :assigns

#default_formats (rw)

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# File 'actionview/lib/action_view/base.rb', line 157

cattr_accessor :default_formats

#field_error_proc (rw)

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# File 'actionview/lib/action_view/base.rb', line 145

cattr_accessor :field_error_proc, default: Proc.new { |html_tag, instance| "<div class=\"field_with_errors\">#{html_tag}</div>".html_safe }

#formats (rw)

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# File 'actionview/lib/action_view/base.rb', line 208

delegate :formats, :formats=, :locale, :locale=, :view_paths, :view_paths=, to: :lookup_context

#locale (rw)

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# File 'actionview/lib/action_view/base.rb', line 208

delegate :formats, :formats=, :locale, :locale=, :view_paths, :view_paths=, to: :lookup_context

#logger (rw)

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# File 'actionview/lib/action_view/base.rb', line 169

class_attribute :logger

#logger?Boolean (rw)

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# File 'actionview/lib/action_view/base.rb', line 169

class_attribute :logger

#lookup_context (readonly)

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# File 'actionview/lib/action_view/base.rb', line 205

attr_reader :view_renderer, :lookup_context

#prefix_partial_path_with_controller_namespace (rw)

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# File 'actionview/lib/action_view/base.rb', line 154

class_attribute :prefix_partial_path_with_controller_namespace, default: true

#prefix_partial_path_with_controller_namespace?Boolean (rw)

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# File 'actionview/lib/action_view/base.rb', line 154

class_attribute :prefix_partial_path_with_controller_namespace, default: true

#raise_on_missing_translations (rw)

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# File 'actionview/lib/action_view/base.rb', line 160

cattr_accessor :raise_on_missing_translations, default: false

#streaming_completion_on_exception (rw)

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# File 'actionview/lib/action_view/base.rb', line 149

cattr_accessor :streaming_completion_on_exception, default: %("><script>window.location = "/500.html"</script></html>)

#view_paths (rw)

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# File 'actionview/lib/action_view/base.rb', line 208

delegate :formats, :formats=, :locale, :locale=, :view_paths, :view_paths=, to: :lookup_context

#view_renderer (readonly)

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# File 'actionview/lib/action_view/base.rb', line 205

attr_reader :view_renderer, :lookup_context

Instance Method Details

#_run(method, template, locals, buffer, add_to_stack: true, &block)

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# File 'actionview/lib/action_view/base.rb', line 243

def _run(method, template, locals, buffer, add_to_stack: true, &block)
  _old_output_buffer, _old_virtual_path, _old_template = @output_buffer, @virtual_path, @current_template
  @current_template = template if add_to_stack
  @output_buffer = buffer
  public_send(method, locals, buffer, &block)
ensure
  @output_buffer, @virtual_path, @current_template = _old_output_buffer, _old_virtual_path, _old_template
end

#compiled_method_container

Raises:

  • (NotImplementedError)
[ GitHub ]

  
# File 'actionview/lib/action_view/base.rb', line 252

def compiled_method_container
  raise NotImplementedError, <<~msg.squish
    Subclasses of ActionView::Base must implement `compiled_method_container`
    or use the class method `with_empty_template_cache` for constructing
    an ActionView::Base subclass that has an empty cache.
  msg
end

#in_rendering_context(options)

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# File 'actionview/lib/action_view/base.rb', line 260

def in_rendering_context(options)
  old_view_renderer  = @view_renderer
  old_lookup_context = @lookup_context

  if !lookup_context.html_fallback_for_js && options[:formats]
    formats = Array(options[:formats])
    if formats == [:js]
      formats << :html
    end
    @lookup_context = lookup_context.with_prepended_formats(formats)
    @view_renderer = ActionView::Renderer.new @lookup_context
  end

  yield @view_renderer
ensure
  @view_renderer = old_view_renderer
  @lookup_context = old_lookup_context
end