Convert String to Money in Thymeleaf

Learn how to convert input Strings to Money type in a Spring Boot application using Thymeleaf. This guide provides step-by-step instructions to solve type conversion issues.
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Converting Strings to Money in Thymeleaf

When developing a web application, you may encounter situations where you need to convert user input from Strings to a specific data type—such as converting input Strings to Money types in a Spring Boot application using Thymeleaf. This need often arises in forms where users enter monetary values, like per capita income or other financial figures. If not managed correctly, this can lead to frustrating errors.

In this guide, we will cover how to effectively convert a String input to a Money type using a custom deserializer. We’ll go through a detailed example including code snippets to ensure a smooth implementation.

Problem Overview

The issue arises when user input from your form cannot be automatically converted into the required Money data type by Hibernate. Typically, a String input can lead to the following error:

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This happens because Hibernate does not know how to handle the conversion from the input String to the desired Money type from the joda-money library.

Solution Steps

Step 1: Create a Custom Deserializer

To address the issue, we can create a custom deserializer for the Money field. This will inform Hibernate on how to correctly convert the input String.

Here’s an example of a custom deserializer class named MoneyDeserializer:

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Step 2: Update Your POJO Class

Next, integrate the custom deserializer into your Governor class where the Money field is defined. Here is how you can edit your POJO class:

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Step 3: Ensure Field Compatible Types

Make sure the types of fields in your form and your class match. For instance, if you are using Double in the form but defined the property as Integer in the class, this can lead to deserialization errors. Ensure there's consistency in data types:

Ensure the age and populationBelowPoverty fields are properly defined as either Integer or Double based on user input.

Step 4: Formatting Date Inputs

When working with dates, ensure that the date format being submitted matches what is expected by Jackson for deserialization. The accepted format generally is YYYY-MM-dd.

Step 5: Test the Controller

Once the deserializer is integrated, modify your controller method to handle incoming requests:

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Example Input

Ensure your JSON follows this structure when sending data:

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Conclusion

By implementing a custom deserializer, we effectively handle the conversion of input Strings to the proper Money type, thus avoiding the common pitfalls associated with type mismatches in a Spring Boot application using Thymeleaf. With the right setup, you can ensure smooth data processing throughout your application.

Feel free to comment below if you have any questions or run into any issues—happy coding!

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