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Instance Public methods

permissions_policy(**options, &block)

Overrides parts of the globally configured Feature-Policy header:

class PagesController < ApplicationController
  permissions_policy do |policy|
    policy.geolocation "https://example.com"
  end
end

Options can be passed similar to before_action. For example, pass only: :index to override the header on the index action only:

class PagesController < ApplicationController
  permissions_policy(only: :index) do |policy|
    policy.camera :self
  end
end

Requires a global policy defined in an initializer, which can be empty:

Rails.application.config.permissions_policy do |policy|
  # policy.gyroscope :none
end

Source: show | on GitHub 

# File actionpack/lib/action_controller/metal/permissions_policy.rb, line 33
def permissions_policy(**options, &block)
  before_action(options) do
    unless request.respond_to?(:permissions_policy)
      raise "Cannot override permissions_policy if no global permissions_policy configured."
    end
    if block_given?
      policy = request.permissions_policy.clone
      instance_exec(policy, &block)
      request.permissions_policy = policy
    end
  end
end