Docs(client): How To Handle Duplicate Names In Generated Types

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Introduction

When working with client generation, it's not uncommon to encounter issues related to duplicate names in generated types. This problem can arise due to various reasons, including naming conflicts between different types or fields. In this article, we'll delve into the world of duplicate names in generated types, exploring the root causes, symptoms, and solutions to help you overcome this challenge.

Understanding the Issue

The issue of duplicate names in generated types can occur when using the Client generation. This is evident from the following error message:

internal/endoflifedate/client/client.gen.go:976:6: ProductResponse redeclared in this block
        internal/endoflifedate/client/client.gen.go:187:6: other declaration of ProductResponse
internal/endoflifedate/client/client.gen.go:984:7: r.HTTPResponse undefined (type ProductResponse has no field or method HTTPResponse)

This error message indicates that there are two declarations of ProductResponse in the same block, leading to a naming conflict. Additionally, the error message mentions that the HTTPResponse field is undefined for the ProductResponse type.

Code Example

To better understand the issue, let's take a look at the following code example:

// ProductReleaseResponse A response containing a release cycle.
type ProductReleaseResponse struct {
	// Result Full information about a product release cycle.
	Result ProductRelease `json:"result"`

	// SchemaVersion Version of this schema.
	SchemaVersion string `json:"schema_version"`
}

// ClientWithResponsesInterface is the interface specification for the client with responses above.
type ClientWithResponsesInterface interface {
	// ProductReleaseWithResponse request
	ProductReleaseWithResponse(ctx context.Context, product string, release string, reqEditors ...RequestEditorFn) (*ProductReleaseResponse, error)
}

type ProductReleaseResponse struct {
	Body         []byte
	HTTPResponse *http.Response
	JSON200      *ProductReleaseResponse
}

// Status returns HTTPResponse.Status
func (r ProductReleaseResponse) Status() string {
	if r.HTTPResponse != nil {
		return r.HTTPResponse.Status
	}
	return http.StatusText(0)
}

In this code example, we have two types named ProductReleaseResponse. The first type is defined as part of the ClientWithResponsesInterface interface, while the second type is a struct with fields Body, HTTPResponse, and JSON200.

Solution: Overriding Response Type Suffix

One way to resolve the issue of duplicate names in generated types is to override the response type suffix using the output-options.response-type-suffix configuration option. This can be achieved by adding the following YAML configuration:

# yaml-language-server: $schema=https://raw.githubusercontent.com/oapi-codegen/oapi-codegen/v2.4.1/configuration-schema.json
# ...
output-options:
  response-type-suffix: Resp

By setting the response-type-suffix to Resp, we can differentiate between the two types with the same name, avoiding naming conflicts.

Conclusion

In conclusion, handling duplicate names in generated types can be a challenging task, especially when working with client generation. By understanding the root causes of the issue, identifying the symptoms, and applying the solutions outlined in this article, you can overcome this challenge and ensure that your generated types are free from naming conflicts.

Best Practices

To avoid duplicate names in generated types, follow these best practices:

  • Use a consistent naming convention throughout your codebase.
  • Avoid using the same name for different types or fields.
  • Use the output-options.response-type-suffix configuration option to override the response type suffix.
  • Document your code thoroughly to ensure that others can understand the naming conventions and avoid conflicts.

Introduction

In our previous article, we explored the issue of duplicate names in generated types, including the root causes, symptoms, and solutions. In this article, we'll delve deeper into the topic, providing a comprehensive Q&A guide to help you overcome this challenge.

Q: What are the common causes of duplicate names in generated types?

A: The common causes of duplicate names in generated types include:

  • Naming conflicts: When two or more types or fields have the same name, it can lead to naming conflicts.
  • Inconsistent naming conventions: Using different naming conventions throughout your codebase can lead to naming conflicts.
  • Overriding response type suffix: Failing to override the response type suffix using the output-options.response-type-suffix configuration option can lead to naming conflicts.

Q: How can I identify duplicate names in generated types?

A: To identify duplicate names in generated types, follow these steps:

  • Use a code analysis tool: Utilize a code analysis tool to scan your codebase for naming conflicts.
  • Review error messages: Carefully review error messages generated by your code, as they often indicate naming conflicts.
  • Use a code formatter: Use a code formatter to ensure that your code is formatted consistently, making it easier to identify naming conflicts.

Q: How can I resolve duplicate names in generated types?

A: To resolve duplicate names in generated types, follow these steps:

  • Use a consistent naming convention: Establish a consistent naming convention throughout your codebase.
  • Avoid using the same name for different types or fields: Ensure that each type and field has a unique name.
  • Override response type suffix: Use the output-options.response-type-suffix configuration option to override the response type suffix.
  • Document your code: Document your code thoroughly to ensure that others can understand the naming conventions and avoid conflicts.

Q: What are the best practices for avoiding duplicate names in generated types?

A: To avoid duplicate names in generated types, follow these best practices:

  • Use a consistent naming convention: Establish a consistent naming convention throughout your codebase.
  • Avoid using the same name for different types or fields: Ensure that each type and field has a unique name.
  • Use the output-options.response-type-suffix configuration option: Override the response type suffix to avoid naming conflicts.
  • Document your code: Document your code thoroughly to ensure that others can understand the naming conventions and avoid conflicts.

Q: Can I use a code generator to avoid duplicate names in generated types?

A: Yes, you can use a code generator to avoid duplicate names in generated types. Code generators can help you generate code with consistent naming conventions and avoid naming conflicts.

Q: How can I ensure that my generated types are free from naming conflicts?

A: To ensure that your generated types are free from naming conflicts, follow these steps:

  • Use a code analysis tool: Utilize a code analysis tool to scan your codebase for conflicts.
  • Review error messages: Carefully review error messages generated by your code, as they often indicate naming conflicts.
  • Use a code formatter: Use a code formatter to ensure that your code is formatted consistently, making it easier to identify naming conflicts.
  • Document your code: Document your code thoroughly to ensure that others can understand the naming conventions and avoid conflicts.

Conclusion

In conclusion, handling duplicate names in generated types requires a comprehensive approach, including understanding the root causes, identifying symptoms, and applying solutions. By following the best practices outlined in this article, you can ensure that your generated types are free from naming conflicts and maintainable.