Methods
Instance Public methods
action_cable_meta_tag()
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' => 'reload' %>
</head>
This is then used by Action Cable to determine the URL of your WebSocket server. Your JavaScript can then connect to the server without needing to specify the URL directly:
window.Cable = require("@rails/actioncable")
window.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" />
📝 Source code
# File actioncable/lib/action_cable/helpers/action_cable_helper.rb, line 33
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