Methods
Instance Public methods
rate_limit(to:, within:, by: -> { request.remote_ip }
Applies a rate limit to all actions or those specified by the normal before_action filters with only: and except:.
The maximum number of requests allowed is specified to: and constrained to the window of time given by within:.
Rate limits are by default unique to the ip address making the request, but you can provide your own identity function by passing a callable in the by: parameter. It’s evaluated within the context of the controller processing the request.
Requests that exceed the rate limit are refused with a 429 Too Many Requests response. You can specialize this by passing a callable in the with: parameter. It’s evaluated within the context of the controller processing the request.
Rate limiting relies on a backing ActiveSupport::Cache store and defaults to config.action_controller.cache_store, which itself defaults to the global config.cache_store. If you don’t want to store rate limits in the same datastore as your general caches, you can pass a custom store in the store parameter.
Examples:
class SessionsController < ApplicationController
rate_limit to: 10, within: 3.minutes, only: :create
end
class SignupsController < ApplicationController
rate_limit to: 1000, within: 10.seconds,
by: -> { request.domain }, with: -> { redirect_to busy_controller_url, alert: "Too many signups on domain!" }, only: :new
end
class APIController < ApplicationController
RATE_LIMIT_STORE = ActiveSupport::Cache::RedisCacheStore.new(url: ENV["REDIS_URL"])
rate_limit to: 10, within: 3.minutes, store: RATE_LIMIT_STORE
end
📝 Source code
# File actionpack/lib/action_controller/metal/rate_limiting.rb, line 47
def rate_limit(to:, within:, by: -> { request.remote_ip }, with: -> { head :too_many_requests }, store: cache_store, **options)
before_action -> { rate_limiting(to: to, within: within, by: by, with: with, store: store) }, **options
end