class Webpacker::Manifest

Singleton registry for accessing the packs path using a generated manifest. This allows javascript_pack_tag, stylesheet_pack_tag, asset_pack_path to take a reference to, say, “calendar.js” or “calendar.css” and turn it into “/packs/calendar-1016838bab065ae1e314.js” or “/packs/calendar-1016838bab065ae1e314.css”.

When the configuration is set to on-demand compilation, with the `compile: true` option in the webpacker.yml file, any lookups will be preceeded by a compilation if one is needed.

Public Class Methods

new(webpacker) click to toggle source
# File lib/webpacker/manifest.rb, line 13
def initialize(webpacker)
  @webpacker = webpacker
end

Public Instance Methods

lookup(name) click to toggle source
# File lib/webpacker/manifest.rb, line 21
def lookup(name)
  compile if compiling?
  find name
end
lookup!(name) click to toggle source
# File lib/webpacker/manifest.rb, line 26
def lookup!(name)
  lookup(name) || handle_missing_entry(name)
end
refresh() click to toggle source
# File lib/webpacker/manifest.rb, line 17
def refresh
  @data = load
end

Private Instance Methods

compile() click to toggle source
# File lib/webpacker/manifest.rb, line 35
def compile
  Webpacker.logger.tagged("Webpacker") { compiler.compile }
end
compiling?() click to toggle source
# File lib/webpacker/manifest.rb, line 31
def compiling?
  config.compile? && !dev_server.running?
end
data() click to toggle source
# File lib/webpacker/manifest.rb, line 60
def data
  if config.cache_manifest?
    @data ||= load
  else
    refresh
  end
end
find(name) click to toggle source
# File lib/webpacker/manifest.rb, line 39
def find(name)
  data[name.to_s].presence
end
handle_missing_entry(name) click to toggle source
# File lib/webpacker/manifest.rb, line 43
def handle_missing_entry(name)
  raise Webpacker::Manifest::MissingEntryError, missing_file_from_manifest_error(name)
end
load() click to toggle source
# File lib/webpacker/manifest.rb, line 68
def load
  if config.public_manifest_path.exist?
    JSON.parse config.public_manifest_path.read
  else
    {}
  end
end
missing_file_from_manifest_error(bundle_name) click to toggle source
# File lib/webpacker/manifest.rb, line 47
    def missing_file_from_manifest_error(bundle_name)
      <<-MSG
Webpacker can't find #{bundle_name} in #{config.public_manifest_path}. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
#{JSON.pretty_generate(@data)}
      MSG
    end