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• Read the page on User Defined Modules

• Read the page on User-Defined Actions

• Read the page on the built-in HTTP library

• Completed the Pico State Lesson

• Be comfortable testing with the testing tab, postman, or an alternative

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Our rule, which selects on the movie:new_rating event, expects a non-empty attribute named movieID and a numeric attribute named rating. These are checked for in lines 10 and 11, respectively, and bound to internal (to the rule) names which happen to match the attribute names in line 12. We convert one of the attributes from the passed-in String to a Number in line 14, using the universal as operator. We check that the rating is in the expected range in line 15. If the rating is value valid (line 17) then we take the HTTP POST action in line 17, also capturing the HTTP response, which we then save in the pico in line 19 (along with a timestamp in line 20).

Finally, in line 21 we raise a movie:rated event for future use, if any. This follows the principle of avoiding dead-end rules.

Using an application

Our ruleset could be used as the back-end for a web-based single page application, or by some other ruleset. For now, you can just test it using the Testing tab:

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