Module: ActionController::Verification::ClassMethods

Defined in:
lib/action_controller/verification.rb

Overview

This module provides a class-level method for specifying that certain actions are guarded against being called without certain prerequisites being met. This is essentially a special kind of before_filter.

An action may be guarded against being invoked without certain request parameters being set, or without certain session values existing.

When a verification is violated, values may be inserted into the flash, and a specified redirection is triggered.

Usage:

class GlobalController < ActionController::Base
  # prevent the #update_settings action from being invoked unless
  # the 'admin_privileges' request parameter exists.
  verify :params => "admin_privileges", :only => :update_post,
         :redirect_to => { :action => "settings" }

  # disallow a post from being updated if there was no information
  # submitted with the post, and if there is no active post in the
  # session, and if there is no "note" key in the flash.
  verify :params => "post", :session => "post", "flash" => "note",
         :only => :update_post,
         :add_flash => { "alert" => "Failed to create your message" },
         :redirect_to => :category_url

Instance Method Summary collapse

Instance Method Details

#verify(options = {}) ⇒ Object

Verify the given actions so that if certain prerequisites are not met, the user is redirected to a different action. The options parameter is a hash consisting of the following key/value pairs:

  • :params: a single key or an array of keys that must be in the @params hash in order for the action(s) to be safely called.

  • :session: a single key or an array of keys that must be in the @session in order for the action(s) to be safely called.

  • :flash: a single key or an array of keys that must be in the flash in order for the action(s) to be safely called.

  • :method: a single key or an array of keys–any one of which must match the current request method in order for the action(s) to be safely called. (The key should be a symbol: :get or :post, for example.)

  • :add_flash: a hash of name/value pairs that should be merged into the session's flash if the prerequisites cannot be satisfied.

  • :redirect_to: the redirection parameters to be used when redirecting if the prerequisites cannot be satisfied.

  • :render: the render parameters to be used when the prerequisites cannot be satisfied.

  • :only: only apply this verification to the actions specified in the associated array (may also be a single value).

  • :except: do not apply this verification to the actions specified in the associated array (may also be a single value).


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# File 'lib/action_controller/verification.rb', line 60

def verify(options={})
  filter_opts = { :only => options[:only], :except => options[:except] }
  before_filter(filter_opts) do |c|
    c.send :verify_action, options
  end
end