From a fully working "starter" implementation, we modified an Xtend template that formed the basis of the implementation, and we altered the output file extension configured for the GenTemplate from. The exact same approach can be used to create Xtext-based GenTemplates that operate on Swagger models.
Please review that document to learn the motivating hypothetical scenario.
Our first step invokes the SCG meta command to create a skeleton project. The command arguments we will use are:. Specifies the directory where the skeleton project will be created; default is the current directory. Specifies the name for the new SCG module, which is put to many uses in the skeleton, some of which imply restrictions on the name that are not enforced by SCG. These include:. It is the advertised name of the module i. It is incorporated into the name of the generator class, which is the name value with its first character upper-cased, concatenated with Generator.
It is incorporated into the advertised description of the model the value returned by CodegenConfig getHelp. It is incorporated into the name of the default output folder used by the module. It is used as the template directory name. This directory will appear as a top-level Java resource directory in the generated project. Specifies the package in which the generator class will reside. The default is io. In preparation for this step we need to install the Swagger Codegen Client jar file.
API First With OpenAPI and Swagger-Codegen
Modify the paths in your command as needed, depending on where your swagger-codegen git clone is located, and where you want the skeleton to be created.
After all the foregoing, this step finally comes down to a single command, which will create our skeleton:. Click Next. Browse to the output folder you specified for the SCG meta command, and you should see the Maven pom. With that entry checked, click Next. At this point your skeleton is complete, but not quite functional. The problem is that the Java class that implements your new generator configures a "supporting" template to run on your model, but the skeleton does not actually include the needed template file.In this post we will see how we can extend Swagger-Codegen by stubbing an implementation for a dotnet applications and also hohw we can use custom templates and plugins to OpenAPI to go beyond just generating the application shel.
Let us look at a simple example with a single example that we will expand upon. Listing 1 shows a minimal pet-store example with a single endpoint that lists the available pets. The first line designates the type, openapi and the OpenAPI version 3.
In this case this object contains a version for this API and a title. The paths object starts at line 5. This is where all the API paths and operations are documented. The subsequent lines until line 18 describes the operation.
Line 8 gives a summary of the operation, while line 9 contains an identifier for the operation. This identifier must be unique across the API. Lines 10 and 11 contains a list of tags for this operation.
This controls under which headings this operation is visible. The operation defines a single response lines 12 to The status code,is given in line 13 and begins an object containing a description in line 14 and a content object staring at line The components section of the OpenAPI document begins at line The schemas directory contains the types of schemas for the data elements used in the paths section described in Json Schema format.
In the current example, we have two Schemas defined: Pets lines: and Pet lines: The type of elements contained are given in the items object which contains a reference to the Pet object, meaning that all items are expected to conform to this schema line The pets objects is a regular object with three properties line: These are id line 30 which is of type integer and has a format specifying that this should be a bit integer.
The name line 33 and tag line 35 properties are both of type string. Finally, the Pet schema specifies that the id and name properties are required, meaning that that must have a non-null value. There exists several tools to visualize OpenAPI specifications. Figure 1 shows how the specification from Listing one is visualized. We can also see the details of the parameters of which there are none in this example and of the responses.
Finally, we also see the list of schemas. The boxes containing each schema object can also be expanded to show its details.Edit, July This Async Spring template in Swagger codegen is deprecated and no longer maintained.
Please use the normal Spring template or use a custom template instead. The plugin and configuration example should still work with other available templates. Keeping this post for reference purposes.
REST services skeleton code generation is a quick way to get started in implementing the service from popular Swagger spec describing the interface. Ideally it should:. The j8-async template is a modified version of it with the following changes:.
This new template was merged into swagger-codegen version 2. Normally the swagger-code gen project just generates stub, this is now what we want. Edit, July This template deprecated, please use the other available ones, or specify a custom template intead. Because it uses a default interface, it will already work out of the box with the stub response. To provide a custom implementation on the operation, just implemented the gerated API then override the stub method.
Keeping this post for reference purposes REST services skeleton code generation is a quick way to get started in implementing the service from popular Swagger spec describing the interface. Ideally it should: Take advantage of Java servlet 3. Post Directory.OpenAPI Generator is a fork of swagger-codegen between version 2. This community-driven version called "OpenAPI Generator" provides similar functionalities and can be used as drop-in replacement.
This guide explains the major differences in order to help you with the migration. OpenAPI Generator 3. If both options are present, you'll be presented with an error. All languages of swagger-codegen have been migrated to openapi-generatorbut some names were changed, in order to be more consistent. We provide a temporary mapping in code for these old values.
You'll receive a warning with instructions to migrate to the new names. Some parameters were renamed. Some examples:. Corresponding java code: CodegenProperty.
If you're not using customized templates with the -t option, you can ignore the mustache variable renaming above. The syntax inside the file stays the same. You don't need to rename the file manually, OpenAPI Generator will do it when your run it against an existing output directory.
When there is no. If you use a generator without specifying each parameter, you might see some differences in the generated code. As example the default package name used in the generated code has changed. If you have extended some generators in your project, and you are looking for a specific class, replace the io. The parameter name for Request Body is named automatically based on the model name e.
To control how the "Request Body" parameter is named, please add the vendor extension x-codegen-request-body-name to the operation:. If your API client is using named parameters in the function call e.
OpenAPI spec v3 has better support for nullable. OpenAPI Generator. Edit this page. Last updated on by William Cheng.I cannot generate nodejs-server using swagger-codegen-cli-v3 when passing any custom template. Go to Solution. View solution in original post. Switch To: SmartBear. License Portal. Sign In Register. SmartBear Support Resources. Community WFH. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for. Search instead for. Did you mean:. Go to solution. Start a topic. Frequent Visitor. Cannot use custom templates with swagger-codegen-cli. RuntimeException: Could not generate api file for 'Auth' at io. All forum topics Previous Topic Next Topic. Accepted Solutions. Re: Cannot use custom templates with swagger-codegen-cli. Occasional Visitor. I'm having the same issue.This article is the second part of a Swagger Codegen series. As you can see, there is a lot of default implementation for the methods which is not necessary for all the use-cases.
Using a custom template is not complicated at all.
Swagger Code Generator
First of all, we have to download the currently used template by Swagger, you can do it by going to the GitHub repository of the code generator and find the templates there for the Spring language. For the 2.
Now we have to set the generator to use this new template for code generation. After executing. Basically, the API interface we got after the generation is coming from the apiController. We start by cleaning up the imports first as by default it has some conditional import statements in case of JDK8, BeanValidation library, Async execution, etc. Now comes the Controller itself.
I like to use delegates for the APIs, so there is the API interface which defines the endpoints and there is a Controller class which has an implementation to call into a Delegate class which has the same methods.
The Controller template looks like this for me:. I also cleaned up the apiDelegate.
The final result looks the following:. Now after the changes we made, executing the code generation will result in the following classes at least which are important for now :.
Just a quick recap, in this part of the series, we saw how to use a custom template for code generation. The full code can be found on GitHub. Give it a try and give me some feedback how you feel about this, in the comments or on Twitter.
Great tutorial. I followed the instructions closely, and got it close to working. However, marking my UserApiDelegateImpl with component is not getting it picked up by the generated controller. Am I missing something? Your email address will not be published. Logger; import org.
LoggerFactory; import org. HttpStatus; import org. ResponseEntity; import org. Autowired; import org. RestController; import org.The source code for the Swagger Codegen can be found in GitHub.Using swagger-codegen to generate C# API for REST service
The following dependencies would need to be installed on your machine before downloading and running the Swagger Codegen. If you have a Mac or a Linux environment, then you could use Homebrew to install the Swagger Codegen.
Visit this folder on Mavenand choose the appropriate version we recommend the latest version. You could download and run the executable. Please visit the installation section of the Swagger Codegen to learn about how to get the Codegen on your machine. To see the various config help section options for specific languages supported by the Swagger Codegen. The Swagger Codegen is an open source project under the Apache license. Sign up here: SwaggerHub Swagger Inspector.
Have an account? Sign in here: SwaggerHub Swagger Inspector. Java, version 7 or higher Installation with Homebrew If you have a Mac or a Linux environment, then you could use Homebrew to install the Swagger Codegen.
List of supported languages To get a list of languages supported by the Swagger Codegen - If you have Homebrew installed: swagger-codegen Else, you could use: java -jar swagger-codegen-cli Contribute The Swagger Codegen is an open source project under the Apache license.
Guidelines Before submitting an issue If you're not using the latest master to generate API clients or server stubs, please give it another try by pulling the latest master as the issue may have already been addressed. Test with the latest master by building the JAR locally to see if the issue has already been addressed. You can also make a suggestion or ask a question by opening an "issue". If you've addaed new vendor extensions as part of your PR, please update the wiki page. For example, run.
If you've questions or concerns, please open a ticket to start a discussion Run the tests in the sample folder, e. SwaggerHub Swagger Inspector.