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In this tutorial, we are going to write a list of rules in Natural Language to validate the input and determine the pass-fail state of a student:
- If the total score is greater than or equal to 50, state pass, otherwise fail
These are the procedural steps for this project.
1. Create a Fact concept to define the inputs: ‘Concept.xml’
There is one object named ‘Person’ and its attributes are Name, Birth year, Test results, Pass state, and Last year results. This will make it easier to manage the variables.
2. Add a Business Glossary to define the expressions: ‘BusinessGlossary.xml’
Using business glossary, you can define expressions such as ‘(Person.LastYearTestResults) + (Person.TestResults)’ with a term ‘Total’. Therefore, you can use the term ‘Total’ in your code instead of using the long expression.
- Total: (Person.LastYearTestResults) + (Person.TestResults)
- Name: Person.Name
- BirthYear: Person.BirthYear
3. Add a Natural Language file and write validation rules in Natural Language: ‘PersonValidation.xml’
Name and BirthYear are defined in the Business Glossary.
when Validate name Name is "" then error = "Name cannot be empty" and isValid = false otherwise Validate BirthYear end when Validate BirthYear BirthYear is null then error = "Birth Year cannot be empty" and isValid = false end
4. Add a flow file: ‘Flow.xml’
Add the created Natural Language file to the flow.
5. Add another Natural Language file: ‘TestResultState.xml’
Write the rules to state the pass-fail grading of a student. Here we can use the term ‘Total’ which is defined in the Business Glossary.
when isValid then DefinePassState end when DefinePassState Total > 50 then Person.Pass = true otherwise Person.Pass = false end
6. Add the Natural Language file to the flow
The flow will show the direction and run all of the files by connecting the two Natural Language files.
Once the code is running without errors in FlexRule Designer, you can test the code in JS Testbed.
1. Open the Natural Language file
2. Click on the ‘JS Test Bed’ icon
3. JS Testbed will open in the web browser
4. Select ‘Code’ to insert the Input Parameters
5. Copy the Input Parameters.
6. Click on ‘Run Logic’
7. Output is displayed in Result section
Download the project
The project can be downloaded from the attachment at the end of the page.