小胡子模板中的条件逻辑？

问题描述 投票：0回答：1

我已经定义了自定义 Mustache 模板，通过在自定义 Codegen 生成器中扩展 AbstractJavaCodegen 类来生成 Java 应用程序。

我的目标是生成一个自定义的ServiceImpl.java文件，并根据操作Id在方法主体中包含条件逻辑。

操作Id可以是以下之一：“createOrder”、“patchOrder”、“deleteOrder”、“retrieveOrder”或“listOrder”。在swagger规范中定义（所有上述操作Id都存在于swagger json中） .

我希望包含每个操作对应的逻辑，而跳过其他操作的不相关逻辑。

例如，这是我的模板的结构：

{{#operations}}
public class {{classname}}ServiceImpl implements {{classname}}Service {

{{#operation}}
@Override
public ResponseEntity<{{>returnTypes}}> {{operationId}}({{#allParams}}{{>optionalDataType}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}) {

 {{#create-operation}}
 // Logic for createOrder operation and skip other operation's logic
 {{/create-operation}}

 {{#patch-operation}}
 // Logic for patchOrder operation and skip other operation's logic
 {{/patch-operation}}

 {{#delete-operation}}
 // Logic for deleteOrder operation and skip other operation's logic
 {{/delete-operation}}

 {{#retrieve-operation}}
 // Logic for retrieveOrder operation and skip other operation's logic
 {{/retrieve-operation}}

 {{#list-operation}}
 // Logic for listOrder operation and skip other operation's logic
 {{/list-operation}}

return new ResponseEntity<>(HttpStatus.OK);
}
  
{{/operation}}

这可以使用 Mustache 模板中的条件逻辑来实现吗？特别是确保基于操作 ID 的每个方法只包含相关的操作逻辑？

如果没有，我们有没有办法使用自定义 Codegen 来做到这一点？

我尝试了什么？

我尝试在将数据传递到 Mustache 模板之前对其进行预处理，但它没有按照我期望的方式工作。

PreProcess data

输出：

它重复了所有方法中所有操作的逻辑，这不符合我的要求。

Output of PreProcess data

mustache openapi-generator swagger-codegen
1个回答
0
投票

我猜测输入到模板中的数据大致类似于以下 JSON(ish) 表示形式。为了演示目的，我简化了一些细节。

{
    operations: [{
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'createProductOrder',
            allParams: [{
                dataType: 'ProductOrderCreate',
                paramName: 'productOrder',
                '-last': true,
            }],
        },
    }, {
        operation: {
            returnTypes: 'Void',
            operationId: 'deleteProductOrder',
            allParams: [{
                dataType: 'String',
                paramName: 'id',
                '-last': true,
            }],
        },
    }, {
        operation: {
            returnTypes: 'List<ProductOrder>',
            operationId: 'listProductOrder',
            allParams: [{
                dataType: 'String',
                paramName: 'fields',
                '-last': false,
            }, {
                dataType: 'Integer',
                paramName: 'offset',
                '-last': false,
            }, {
                dataType: 'Integer',
                paramName: 'limit',
                '-last': true,
            }],
        },
    }, {
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'patchProductOrder',
            allParams: [{
                dataType: 'String',
                paramName: 'id',
                '-last': false,
            }, {
                dataType: 'ProductOrderUpdate',
                paramName: 'productOrder',
                '-last': true,
            }],
        },
    }, {
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'retrieveProductOrder',
            allParams: [{
                dataType: 'String',
                paramName: 'id',
                '-last': false,
            }, {
                dataType: 'String',
                paramName: 'fields',
                '-last': true,
            }],
        },
    }],
}

在数据预处理尝试中，您循环遍历 

operations
并调用 
additionalProperties.put
以便添加 
create-operation
等属性。我不知道 OpenAPI Generator，但我怀疑此方法会在输入数据的根部插入属性。因此，在第一次迭代之后，您的输入数据看起来像这样（假装 
operations
也位于根）：

{
    operations: [{
        operation: {
            operationId: 'createProductOrder',
            // ...
        },
    }, {
        // ...
    }],
    'create-operation': true,
}

循环完成后，它将如下所示：

{
    operations: [{
        operation: {
            operationId: 'createProductOrder',
            // ...
        },
    }, {
        // ...
    }],
    'create-operation': true,
    'delete-operation': true,
    'list-operation': true,
    'patch-operation': true,
    'retrieve-operation': true,
}

如果将以下保存状态复制粘贴到 Mustache Playground 的加载/存储框中，然后按渲染按钮，您将看到这确实产生了您所得到的结果：

{"data":{"text":"{\n    operations: [{\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'createProductOrder',\n            allParams: [{\n                dataType: 'ProductOrderCreate',\n                paramName: 'productOrder',\n                '-last': true,\n            }],\n        },\n    }, {\n        operation: {\n            returnTypes: 'Void',\n            operationId: 'deleteProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': true,\n            }],\n        },\n    }, {\n        operation: {\n            returnTypes: 'List<ProductOrder>',\n            operationId: 'listProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'fields',\n                '-last': false,\n            }, {\n                dataType: 'Integer',\n                paramName: 'offset',\n                '-last': false,\n            }, {\n                dataType: 'Integer',\n                paramName: 'limit',\n                '-last': true,\n            }],\n        },\n    }, {\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'patchProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': false,\n            }, {\n                dataType: 'ProductOrderUpdate',\n                paramName: 'productOrder',\n                '-last': true,\n            }],\n        },\n    }, {\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'retrieveProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': false,\n            }, {\n                dataType: 'String',\n                paramName: 'fields',\n                '-last': true,\n            }],\n        },\n    }],\n    'create-operation': true,\n    'delete-operation': true,\n    'list-operation': true,\n    'patch-operation': true,\n    'retrieve-operation': true,\n}"},"templates":[{"name":"main","text":"{{#operations}}\n{{#operation}}\n@Override\npublic ResponseEntity<{{&returnTypes}}> {{operationId}}({{#allParams}}{{dataType}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}) {\n    {{#create-operation}}\n    // Logic for createOrder operation and skip other operation's logic\n    {{/create-operation}}\n    {{#patch-operation}}\n    // Logic for patchOrder operation and skip other operation's logic\n    {{/patch-operation}}\n    {{#delete-operation}}\n    // Logic for deleteOrder operation and skip other operation's logic\n    {{/delete-operation}}\n    {{#retrieve-operation}}\n    // Logic for retrieveOrder operation and skip other operation's logic\n    {{/retrieve-operation}}\n    {{#list-operation}}\n    // Logic for listOrder operation and skip other operation's logic\n    {{/list-operation}}\n    return new ResponseEntity<>(HttpStatus.OK);\n}\n  \n{{/operation}}\n{{/operations}}"}]}

为什么会出现这种情况？因为 Mustache 使用上下文堆栈。当您迭代列表或数组时，输入数据的较低级别保持可见。因此，每个 

operation
都可以看到每个 
create-operation
、
delete-operation
等属性，从而导致所有可选方法体都包含在每个渲染操作中。

模板正确。您只需要更改预处理，以便像 

create-operation
这样的属性插入到每个单独的 
operation
中，而不是在根级别。换句话说，您希望输入数据如下所示：

{
    operations: [{
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'createProductOrder',
            allParams: [ /*...*/ ],
            'create-operation': true,
        },
    }, {
        operation: {
            returnTypes: 'Void',
            operationId: 'deleteProductOrder',
            allParams: [ /*...*/ ],
            'delete-operation': true,
        },
    }, {
        operation: {
            returnTypes: 'List<ProductOrder>',
            operationId: 'listProductOrder',
            allParams: [ /*...*/ ],
            'list-operation': true,
        },
    }, {
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'patchProductOrder',
            allParams: [ /*...*/ ],
            'patch-operation': true,
        },
    }, {
        operation: {
            returnTypes: 'ProductOrder',
            operationId: 'retrieveProductOrder',
            allParams: [ /*...*/ ],
            'retrieve-operation': true,
        },
    }],
}

以下 savestate 表明这确实会产生所需的输出：

{"data":{"text":"{\n    operations: [{\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'createProductOrder',\n            allParams: [{\n                dataType: 'ProductOrderCreate',\n                paramName: 'productOrder',\n                '-last': true,\n            }],\n            'create-operation': true,\n        },\n    }, {\n        operation: {\n            returnTypes: 'Void',\n            operationId: 'deleteProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': true,\n            }],\n            'delete-operation': true,\n        },\n    }, {\n        operation: {\n            returnTypes: 'List<ProductOrder>',\n            operationId: 'listProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'fields',\n                '-last': false,\n            }, {\n                dataType: 'Integer',\n                paramName: 'offset',\n                '-last': false,\n            }, {\n                dataType: 'Integer',\n                paramName: 'limit',\n                '-last': true,\n            }],\n            'list-operation': true,\n        },\n    }, {\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'patchProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': false,\n            }, {\n                dataType: 'ProductOrderUpdate',\n                paramName: 'productOrder',\n                '-last': true,\n            }],\n            'patch-operation': true,\n        },\n    }, {\n        operation: {\n            returnTypes: 'ProductOrder',\n            operationId: 'retrieveProductOrder',\n            allParams: [{\n                dataType: 'String',\n                paramName: 'id',\n                '-last': false,\n            }, {\n                dataType: 'String',\n                paramName: 'fields',\n                '-last': true,\n            }],\n            'retrieve-operation': true,\n        },\n    }],\n}"},"templates":[{"name":"main","text":"{{#operations}}\n{{#operation}}\n@Override\npublic ResponseEntity<{{&returnTypes}}> {{operationId}}({{#allParams}}{{dataType}} {{paramName}}{{^-last}}, {{/-last}}{{/allParams}}) {\n    {{#create-operation}}\n    // Logic for createOrder operation and skip other operation's logic\n    {{/create-operation}}\n    {{#patch-operation}}\n    // Logic for patchOrder operation and skip other operation's logic\n    {{/patch-operation}}\n    {{#delete-operation}}\n    // Logic for deleteOrder operation and skip other operation's logic\n    {{/delete-operation}}\n    {{#retrieve-operation}}\n    // Logic for retrieveOrder operation and skip other operation's logic\n    {{/retrieve-operation}}\n    {{#list-operation}}\n    // Logic for listOrder operation and skip other operation's logic\n    {{/list-operation}}\n    return new ResponseEntity<>(HttpStatus.OK);\n}\n  \n{{/operation}}\n{{/operations}}"}]}

不幸的是，由于我不了解 OpenAPI Generator，所以我无法告诉您获取上述形状的数据的最正确方法是什么。也许其他人可以添加解决这个问题的答案。

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