Conditional Validation Based on Enum Values

🔹 Godantic Release Notes - Version 1.3.0

🚀 New Feature: Conditional Validation Based on Enum Values 🚀

🔹 What's New?

✅ Conditional Field Validation Using the when Tag

• Fields can now be validated only when another field has a specific value.
• Example:

  type User struct {
      RegNo *string `json:"reg_no" when:"context.type=organization;binding=required"`
  }
  

  🔹 reg_no is required only when context.type is "organization".

✅ Support for Multiple Conditions

• You can define multiple dependent fields in a single when tag.
• Example:

  type Business struct {
      VATNumber *string `json:"vat_number" when:"context.type=business;context.country=EU;binding=required"`
  }
  

  🔹 vat_number is required only when context.type=business AND context.country=EU.

✅ Operator Support
Currently, the = operator is supported for exact matches:

Operator	Example	Meaning
=	context.type=business	Field must be equal to value

---

🔧 Improvements & Fixes

✅ Optimized validation performance with precomputed enum value maps.
✅ Fixed = prefix issue in parseCondition(), ensuring values are extracted correctly.
✅ Clearer error messages when a required field is missing due to a condition.

---

📌 Example Usage

Valid JSON Input

{
  "context": { "type": "organization" },
  "user": { "reg_no": "56789" }
}

✅ Passes validation because reg_no is provided for organization.

Invalid JSON Input

{
  "context": { "type": "organization" },
  "user": {}
}

❌ Fails validation with:

Field <user.reg_no> is required when context.type=organization

---

📢 Upgrade Guide

To upgrade your project to this version, update godantic using:

go get -u github.com/grahms/godantic

Then, update your structs to use the new when tag for conditional validation.

---

🔮 What's Next?

🟢 Support for additional operators (!=, >, <, >=, <=)
🟢 More binding options (regex, ignore, default)
🟢 Better structured error reporting

---

💡 Feedback & Contributions

Have suggestions or improvements? Open an issue or PR on GitHub.

🚀 Enjoy better validation with godantic! 🚀

### **🔹 Godantic Release Notes - Version X.X.X** 🚀 **New Feature: Conditional Validation Based on Enum Values** 🚀

🔹 What's New?

✅ Conditional Field Validation Using the when Tag

• Fields can now be validated only when another field has a specific value.
• Example:

  type User struct {
      RegNo *string `json:"reg_no" when:"context.type=organization;binding=required"`
  }

  🔹 reg_no is required only when context.type is "organization".

✅ Support for Multiple Conditions

• You can define multiple dependent fields in a single when tag.
• Example:

  type Business struct {
      VATNumber *string `json:"vat_number" when:"context.type=business;context.country=EU;binding=required"`
  }

  🔹 vat_number is required only when context.type=business AND context.country=EU.

✅ Operator Support
Currently, the = operator is supported for exact matches:

Operator	Example	Meaning
=	context.type=business	Field must be equal to value

---

🔧 Improvements & Fixes

✅ Optimized validation performance with precomputed enum value maps.

✅ Clearer error messages when a required field is missing due to a condition.

---

📌 Example Usage

Valid JSON Input

{
  "context": { "type": "organization" },
  "user": { "reg_no": "56789" }
}

✅ Passes validation because reg_no is provided for organization.

Invalid JSON Input

{
  "context": { "type": "organization" },
  "user": {}
}

❌ Fails validation with:

Field <user.reg_no> is required when context.type=organization

---

📢 Upgrade Guide

To upgrade your project to this version, update godantic using:

go get -u github.com/grahms/godantic

Then, update your structs to use the new when tag for conditional validation.

---

🔮 What's Next?

🟢 Support for additional operators (!=, >, <, >=, <=)
🟢 More binding options (regex, ignore, default)
🟢 Better structured error reporting

---

💡 Feedback & Contributions

Have suggestions or improvements? Open an issue or PR on [GitHub](https://github.com/grahms/godantic).

🚀 Enjoy better validation with godantic! 🚀