Aasm gem

It currently provides adapters for ActiveRecordMongoidand Mongomapper but it can be used for any Ruby class, no matter what parent class it aasm gem if any.

The gem exposes the generate Rake task, that can be used to generate the diagrams of state machines into PNG images. The generate task accepts two parameters:. If no state machine name is provided, the task will use default for the file name. Once installed, the gem automatically integrates with Rails via Railties and exposes the task automatically. If the model contains only one state machine, or you just want to generate for the "default" one you can skip the state machine name parameter. For plain Ruby projects the gem includes a Rakefile that can be loaded in your project's Rakefile, using source code along the lines of:. AASM Diagram is heavily inspired by rails-erd.

Aasm gem

It currently provides adapters for many ORMs but it can be used for any Ruby class, no matter what parent class it has if any. Adding a state machine is as simple as including the AASM module and start defining states and events together with their transitions :. This provides you with a couple of public methods for instances of the class Job :. If you don't like exceptions and prefer a simple true or false as response, tell AASM not to be whiny :. When firing an event, you can pass a block to the method, it will be called only if the transition succeeds :. You can define a number of callbacks for your events, transitions and states. These methods, Procs or classes will be called when certain criteria are met, like entering a particular state:. AASM will also initialize LogRunTime and run the call method for you after the transition from running to finished in the example above. You can pass arguments to the class by defining an initialize method on it, like this:. Note that Procs are executed in the context of a record, it means that you don't need to expect the record as an argument, just call the methods you need. All guards and after callbacks will receive these parameters. If the first argument to the event is a state e. Add comma separated parameter for guards and callbacks. In case of an error during the event processing the error is rescued and passed to :error callback, which can handle it or re-raise it for further propagation. Here you can see a list of all possible callbacks, together with their order of calling:.

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When it changes colors, the next color is based on the current one. You could write some if statements like this:. Every state knows itself so there is no need to check for the current state. This translates into less conditional statements which are often a source of complexity. However, we still want to share the initialize method between all the states because all of them need the context TrafficLight object to signal a state change. You can use a state machine to solve games that depend on the current state, like RubyWarrior. If you want to keep track of the current state while making sure that the transitions are valid then you can use a state machine gem like AASM.

It currently provides adapters for many ORMs but it can be used for any Ruby class, no matter what parent class it has if any. Adding a state machine is as simple as including the AASM module and start defining states and events together with their transitions :. This provides you with a couple of public methods for instances of the class Job :. If you don't like exceptions and prefer a simple true or false as response, tell AASM not to be whiny :. When firing an event, you can pass a block to the method, it will be called only if the transition succeeds :. You can define a number of callbacks for your events, transitions and states. These methods, Procs or classes will be called when certain criteria are met, like entering a particular state:. AASM will also initialize LogRunTime and run the call method for you after the transition from running to finished in the example above. You can pass arguments to the class by defining an initialize method on it, like this:.

Aasm gem

It currently provides adapters for ActiveRecord and Mongoid , but it can be used for any Ruby class, no matter what parent class it has if any. Adding a state machine is as simple as including the AASM module and start defining states and events together with their transitions :. If you don't like exceptions and prefer a simple true or false as response, tell AASM not to be whiny :. You can define a number of callbacks for your transitions. These methods will be called, when certain criteria are met, like entering a particular state:. In case of an error during the event processing the error is rescued and passed to :error callback, which can handle it or re-raise it for further propagation.

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More Examples. For this you can set up a guard per transition, which will run before actually running the transition. Custom properties. Manually from RubyGems. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. The current event triggered. You could write some if statements like this:. Since version 3. Handling naming conflicts between multiple state machines. You can also pass in nil as the desired end state, and AASM will try to transition to the first end state defined for that event. You can explicitly pass the name of the method which provides access to the enumeration mapping as a value of enum , or you can simply set it to true. There are currently 3 transactional callbacks that can be handled on the event, and 2 transactional callbacks for all events. All guards and after callbacks will receive these parameters.

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So, for example, to use inspection on a class level, you have to use SimpleMultipleExample. AASM automatically generates constants for each status so you don't have to explicitly define them. You switched accounts on another tab or window. Take a look at ActiveRecord Nested Transactions if you want to know more about this. Multiple state machines per class are supported. This provides you with a couple of public methods for instances of the class Job :. If the model contains only one state machine, or you just want to generate for the "default" one you can skip the state machine name parameter. Latest commit. You can define a number of callbacks for your transitions. AASM will also initialize LogRunTime and run the call method for you after the transition from running to finished in the example above. Topics ruby graphviz state-machine aasm. Releases 89 tags.