This adds a new hook type. It will define both a class method that you can use to add hooks, as well as an instance method that you can use to call all hooks of that type. The class method can be called with a symbol or a block or both. If a block is given and and symbol is not, it adds the hook block to the hook type. If a block and symbol are both given, it replaces the hook block associated with that symbol for a given hook type, or adds it if there is no hook block with that symbol for that hook type. If no block is given, it assumes the symbol specifies an instance method to call and adds it to the hook type.
If any before hook block returns false, the instance method will return false immediately without running the rest of the hooks of that type.
It is recommended that you always provide a symbol to this method, for descriptive purposes. It's only necessary to do so when you are using a system that reloads code.
Example of usage:
class MyModel define_hook :before_move_to before_move_to(:check_move_allowed){|o| o.allow_move?} def move_to(there) return if before_move_to == false # move MyModel object to there end end
Do not call this method with untrusted input, as that can result in arbitrary code execution.
# File lib/sequel/plugins/hook_class_methods.rb, line 81 def add_hook_type(*hooks) Model::HOOKS.concat(hooks) hooks.each do |hook| @hooks[hook] = [] instance_eval("def #{hook}(method = nil, &block); add_hook(:#{hook}, method, &block) end", __FILE__, __LINE__) class_eval("def #{hook}; model.hook_blocks(:#{hook}){|b| return false if instance_eval(&b) == false}; end", __FILE__, __LINE__) end end
REMOVE40
# File lib/sequel/plugins/hook_class_methods.rb, line 45 def after_initialize(method = nil, &block) Sequel::Deprecation.deprecate('The Model after_initialize hook', 'The hook_class_methods plugin will no longer support the hook. Please use the after_initialize plugin and define the after_initialize hook directly') add_hook(:after_initialize, method, &block) end
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