Unlocking the Power of Salesforce Custom Metadata Types

Harnessing the Power of Apex: Exploring Custom Salesforce Metadata Types for Dynamic Solutions

As Salesforce continues to evolve, Apex remains a vital tool for developers looking to build robust, scalable solutions. Among its many features, Salesforce Custom Metadata Types stand out as a powerful mechanism for creating dynamic, configurable applications. In this blog post, we’ll delve into Custom Metadata Types, their benefits, and practical use cases, complete with code examples to illustrate their implementation.

Understanding Custom Metadata Types

Custom Metadata Types in Salesforce allow you to define application configurations that can be deployed from one environment to another. Unlike Custom Settings, which are meant for data that rarely changes, Custom Metadata Types are designed for metadata that can be versioned and packaged, making them ideal for reusable configurations.

Benefits of Custom Metadata Types

  1. Deployable Configuration: Custom Metadata Types can be included in managed packages and deployed across different Salesforce environments.
  2. Scalability: They provide a scalable way to manage configuration data without hitting governor limits.
  3. Security: They respect the platform’s security model, ensuring sensitive configuration data is protected.
  4. Ease of Use: Accessible through SOQL, Custom Metadata Types can be easily queried and utilized in Apex.

Real-World Example: Dynamic Field Mapping

Consider a scenario where you need to map fields between different objects dynamically. For instance, mapping fields from a custom object to a standard object like Account. Using Custom Metadata Types, you can create flexible, maintainable mappings without hardcoding field relationships.

Step 1: Define the Custom Metadata Type

First, create a Custom Metadata Type called FieldMapping__mdt with the following fields:

  • Source Object (Source_Object__c): Text(255)
  • Source Field (Source_Field__c): Text(255)
  • Target Object (Target_Object__c): Text(255)
  • Target Field (Target_Field__c): Text(255)

Step 2: Populate the Custom Metadata Records

Populate FieldMapping__mdt with records defining your field mappings. For example:

Source Object Source Field Target Object Target Field
CustomObject__c CustomField__c Account CustomField__c
CustomObject__c AnotherField__c Account AnotherCustomField__c

Step 3: Implement Apex Code to Use the Mappings

Use the following Apex code to dynamically map and copy field values based on the metadata configuration:

public class FieldMapper {
public static void mapFields(SObject source, SObject target) {
String sourceObjectName = source.getSObjectType().getDescribe().getName();
String targetObjectName = target.getSObjectType().getDescribe().getName();

List<FieldMapping__mdt> mappings = [
SELECT Source_Field__c, Target_Field__c
FROM FieldMapping__mdt
WHERE Source_Object__c = :sourceObjectName AND Target_Object__c = :targetObjectName

for (FieldMapping__mdt mapping : mappings) {
try {
String sourceField = (String) source.get(mapping.Source_Field__c);
target.put(mapping.Target_Field__c, sourceField);
} catch (Exception e) {
System.debug(‘Error mapping field: ‘ + e.getMessage());

// Example usage
SObject source = [SELECT CustomField__c, AnotherField__c FROM CustomObject__c WHERE Id = :someId];
SObject target = new Account();
FieldMapper.mapFields(source, target);
insert target;

Real-World Scenario: Feature Toggles

Another practical use case for Custom Metadata Types is implementing feature toggles. Feature toggles allow you to enable or disable functionality without deploying new code, providing a way to manage features dynamically.

Step 1: Define the Custom Metadata Type

Create a Custom Metadata Type called FeatureToggle__mdt with the following fields:

  • Feature Name (Feature_Name__c): Text(255)
  • Is Enabled (Is_Enabled__c): Checkbox

Step 2: Populate the Custom Metadata Records

Populate FeatureToggle__mdt with records defining your feature toggles. For example:

Feature Name Is Enabled
NewUI true
BetaFeature false

Step 3: Implement Apex Code to Check Feature Toggles

Use the following Apex code to check if a feature is enabled:

public class FeatureManager {
public static Boolean isFeatureEnabled(String featureName) {
FeatureToggle__mdt featureToggle = [
SELECT Is_Enabled__c
FROM FeatureToggle__mdt
WHERE Feature_Name__c = :featureName
return featureToggle != null && featureToggle.Is_Enabled__c;

// Example usage
if (FeatureManager.isFeatureEnabled(‘NewUI’)) {
// Execute code for the new UI
} else {
// Fallback to the old UI


Custom Metadata Types provide a powerful way to create dynamic, configurable solutions in Salesforce. Whether you’re mapping fields dynamically or implementing feature toggles, Custom Metadata Types offer a scalable, secure, and maintainable approach to handling configuration data. By incorporating these patterns into your development practices, you can build more flexible and robust Salesforce applications.

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