rails 6中的asset_pack_path和image_pack_tag之间有什么区别

Question

根据我的观点，image_pack_tag是我们在视图中用来将图像放置在HTML表单中的助手。但在webpack的文档中，我也看到了asset_pack_path。现在我对此感到困惑。这里有人知道确切的区别吗

Answer 1

asset_pack_path只返回路径。image_pack_tag返回一个包含<img>html元素的字符串。

module Webpacker::Helper
...
# Computes the relative path for a given Webpacker asset.
# Returns the relative path using manifest.json and passes it to path_to_asset helper.
# This will use path_to_asset internally, so most of their behaviors will be the same.
#
# Example:
#
#   # When extract_css is false in webpacker.yml and the file is a css:
#   <%= asset_pack_path 'calendar.css' %>  # => nil
#
#   # When extract_css is true in webpacker.yml or the file is not a css:
#   <%= asset_pack_path 'calendar.css' %> # => "/packs/calendar-1016838bab065ae1e122.css"
def asset_pack_path(name, **options)
if current_webpacker_instance.config.extract_css? || !stylesheet?(name)
path_to_asset(current_webpacker_instance.manifest.lookup!(name), options)
end
end
# Computes the absolute path for a given Webpacker asset.
# Returns the absolute path using manifest.json and passes it to url_to_asset helper.
# This will use url_to_asset internally, so most of their behaviors will be the same.
#
# Example:
#
#   # When extract_css is false in webpacker.yml and the file is a css:
#   <%= asset_pack_url 'calendar.css' %> # => nil
#
#   # When extract_css is true in webpacker.yml or the file is not a css:
#   <%= asset_pack_url 'calendar.css' %> # => "http://example.com/packs/calendar-1016838bab065ae1e122.css"
def asset_pack_url(name, **options)
if current_webpacker_instance.config.extract_css? || !stylesheet?(name)
url_to_asset(current_webpacker_instance.manifest.lookup!(name), options)
end
end
# Creates an image tag that references the named pack file.
#
# Example:
#
#  <%= image_pack_tag 'application.png', size: '16x10', alt: 'Edit Entry' %>
#  <img alt='Edit Entry' src='/packs/application-k344a6d59eef8632c9d1.png' width='16' height='10' />
#
#  <%= image_pack_tag 'picture.png', srcset: { 'picture-2x.png' => '2x' } %>
#  <img srcset= "/packs/picture-2x-7cca48e6cae66ec07b8e.png 2x" src="/packs/picture-c38deda30895059837cf.png" >
def image_pack_tag(name, **options)
if options[:srcset] && !options[:srcset].is_a?(String)
options[:srcset] = options[:srcset].map do |src_name, size|
"#{resolve_path_to_image(src_name)} #{size}"
end.join(", ")
end
image_tag(resolve_path_to_image(name), options)
end
end