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module ActionCable
module Helpers
module ActionCableHelper
# Returns an "action-cable-url" meta tag with the value of the URL specified in your
# configuration. Ensure this is above your JavaScript tag:
#
# <head>
# <%= action_cable_meta_tag %>
# <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
# </head>
#
# This is then used by Action Cable to determine the URL of your WebSocket server.
# Your CoffeeScript can then connect to the server without needing to specify the
# URL directly:
#
# #= require cable
# @App = {}
# App.cable = Cable.createConsumer()
#
# Make sure to specify the correct server location in each of your environment
# config files:
#
# config.action_cable.mount_path = "/cable123"
# <%= action_cable_meta_tag %> would render:
# => <meta name="action-cable-url" content="/cable123" />
#
# config.action_cable.url = "ws://actioncable.com"
# <%= action_cable_meta_tag %> would render:
# => <meta name="action-cable-url" content="ws://actioncable.com" />
#
def action_cable_meta_tag
tag "meta", name: "action-cable-url", content: (
ActionCable.server.config.url ||
ActionCable.server.config.mount_path ||
raise("No Action Cable URL configured -- please configure this at config.action_cable.url")
)
end
end
end
end
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