How to Use Microflows in Mendix Applications

Microflows are a powerful automation tool in Mendix that enable developers to define business logic visually without writing extensive code. They streamline processes by connecting entities, APIs, and workflows, making application development more efficient and scalable.

What Are Microflows in Mendix?

A Microflow is a graphical representation of logic that automates tasks such as data manipulation, decision-making, and integrations. Unlike traditional coding approaches, Microflows use drag-and-drop elements for building executable workflows within Mendix applications.

Key Features:

• Automates processes such as saving records, validating input, or calling APIs.
• Executes decisions based on conditions (if-else logic).
• Integrates with external systems using REST, SOAP, or database queries.
• Enhances performance by reducing manual scripting.

Step 1: Creating a Microflow in Mendix

1. Open Mendix Studio or Mendix Studio Pro

Navigate to your Mendix App and go to Project Explorer.

Locate the domain model where your entities are defined.

2. Create a New Microflow

Right-click on the Module where you want to add the Microflow.

Select Add Microflow and give it a descriptive name.

3. Define Microflow Inputs and Outputs

Microflows receive parameters (e.g., user input, database entities).

Define the return value (objects, lists, or simple values).

Step 2: Adding Logic to a Microflow

1. Retrieve Data from the Database

Use the Retrieve action to get records based on conditions.

Specify whether to retrieve one object or a list.

2. Apply Decision Logic (If-Else Statements)

Use Exclusive Splits to create conditional flows.

Example: If an order total exceeds $100, apply a discount.

3. Call External APIs

Use Call REST Service to fetch data from external sources.

Map the API response to Mendix entities.

4. Create and Commit Objects

Use Create Object to instantiate new records.

Apply Commit Changes to save them in the database.

Step 3: Executing and Debugging Microflows

1. Trigger Microflows from UI Elements

Link Microflows to buttons, navigation menus, or form submissions.

Example: A "Submit" button calls a Microflow to save user data.

2. Debug Using Breakpoints

Place breakpoints to analyze data during execution.

Use the Debugger to track errors and unexpected behavior.

3. Optimize for Performance

Avoid unnecessary database queries in loops.

Use background execution for complex workflows.

Final Thoughts

Microflows in Mendix simplify business logic automation, enabling developers to build efficient and scalable applications without extensive coding. By leveraging data retrieval, decision logic, API calls, and debugging tools, teams can enhance application functionality while maintaining flexibility. 

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