> For the complete documentation index, see [llms.txt](https://docs.decentraland.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.decentraland.org/contributor/contributor-zh/jiao-cheng/how-to-create-new-entity-type.md).

# 如何创建新的实体类型

#### 什么时候需要创建一个新实体？

首先，检查现有实体是否可以解决所需的用例，以避免对解决方案进行过度设计。如果 <https://github.com/decentraland/common-schemas/blob/main/src/platform/entity.ts#L13> 中定义的现有实体类型都不能满足需求，那么你可能需要创建一种新的实体类型。

#### 首先回答：

* 这个新实体是 NFT 集合吗？
* 如何验证所有权？
* 它的大小会是多少？
* 将创建多少个实体？

#### 步骤

首先在 <https://github.com/decentraland/adr> 创建一个 ADR，在其中定义 schema 以及开始验证新实体的日期。

**仓库**

**@dcl/schemas**

1. 在枚举中创建新的实体类型：<https://github.com/decentraland/common-schemas/blob/main/src/platform/entity.ts#L19>
2. 在 <https://github.com/decentraland/common-schemas/tree/main/src/platform> 中创建文件夹和文件，生成类型和 JSON schema，例如：<https://github.com/decentraland/common-schemas/blob/main/src/platform/profile/profile.ts#L20>

**@dcl/content-validator**

实现 ADR 中定义的校验，并考虑该 ADR 的日期，代码位于 <https://github.com/decentraland/content-validator/blob/main/src/validations/timestamps.ts。例如：https://github.com/decentraland/content-validator/blob/main/src/validations/items/emotes.ts#L8>

1. 在 <https://github.com/decentraland/content-validator/tree/main/src/validations/access-checker> 中添加检查新实体类型所有权的代码
2. 为新类型实现 validationForType，例如：<https://github.com/decentraland/content-validator/blob/main/src/validations/profile.ts#L112>
3. 在这里你需要在 <https://github.com/decentraland/content-validator/blob/main/src/validations/ADR51.ts> 中定义每个实体的最大大小。

**@dcl/urn-resolver**

1. 如果新实体对应的是一个集合，那么不需要添加任何内容。
2. 如果不是，则为新实体创建一个新的 urn，并在 <https://github.com/decentraland/urn-resolver> 中定义它，同时在 <https://github.com/decentraland/urn-resolver/blob/main/src/resolvers.ts#L23> 添加一个 resolver

**Catalyst：Content Server**

1. 数据库无需更改。
2. 更新上述所有已修改的库。

**Catalyst：Lambdas Server**

1. 更新上述所有已修改的库。
2. 检查是否需要更新 profile sanitization（`/lambdas/profiles` 端点）
3. 检查是否需要更新 erc collections 端点（`/lambdas/collections` 端点）
4. 创建一个端点来展示该实体，例如 `/lambdas/wearables-by-owner`


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