# Follow
"Follow" 是一种社交媒体术语，用于表示一个用户关注了另一个用户的帐户，以便随时获得该用户发布的最新更新和内容。通过关注其他用户，人们可以获得感兴趣的内容和信息，以及与其他用户进行交流和互动的机会。
我们提供了Follow合约，用于表示单向的关注关系。
## Schema
### FollowRegister
FollowRegister对应的[schema](https://arweave.net/auPfoCDBtJ3RJ_WyUqV9O7GAARDzkUT4TSuj9uuax-0) 以ttl文件的形式保存至Arweave，交易哈希将作为schemaURI，在初始化合约时传入，参数示例：
```
ar://auPfoCDBtJ3RJ_WyUqV9O7GAARDzkUT4TSuj9uuax-0
```
用于描述某个地址的Follow合约地址，完整的rdf示例如下：
```
:Soul_0x0000000000000000000000000000000000000011 p:connectionContract :Activity_0x12345678901111111000000000
```
* schema 前缀列表
```
PREFIX :
PREFIX p:
PREFIX rdf:
PREFIX xsd:
PREFIX rdfs:
```
* Class
:Soul表示接受和绑定域名解析的地址;:Contract用于表示Follow合约的地址
```
:Soul a rdfs:Class ;
rdfs:label "Soul" ;
rdfs:comment "A soul." .
:Contract a rdfs:Class ;
rdfs:label "Contract" ;
rdfs:comment "A contract." .
```
* Predicate
p:followContract用于描述某个地址持有的follow合约地址
```
p:followContract a rdf:Property ;
rdfs:label "followContract" ;
rdfs:comment "The soul's follow contract." ;
rdfs:domain :Soul ;
rdfs:range :Contract .
```
### Follow
Follow合约对应的[schema](https://arweave.net/-2hCuTMqo1fz2iyzf7dbEbzoyceod5KFOyGGqNiEQWY) 以ttl文件的形式保存至Arweave，交易哈希将作为schemaURI，在初始化合约时传入，参数示例：
```
ar://-2hCuTMqo1fz2iyzf7dbEbzoyceod5KFOyGGqNiEQWY
```
描述某个地址following了当前合约的owner，完整的rdf示例如下：
```
:Soul_0x0000000000000000000000000000000000000022 p:following :Soul_0x0000000000000000000000000000000000000011
```
* schema 前缀列表
```
PREFIX :
PREFIX p:
PREFIX rdf:
PREFIX xsd:
PREFIX rdfs:
```
* Class
:Soul表示接受和绑定域名解析的地址;:Contract用于表示Follow合约的地址
```
:Soul a rdfs:Class ;
rdfs:label "Soul" ;
rdfs:comment "A soul." .
```
* Predicate
p:following 描述地址间的follow关系
```
p:following a rdf:Property ;
rdfs:label "following" ;
rdfs:comment "Following a soul." ;
rdfs:domain :Soul ;
rdfs:range :Soul .
```
## 合约
Follow的合约模版，我们把FollowRegister作为工厂合约和注册中心，用于部署和记录用户的Follow合约。
### FollowRegister
```solidity
interface IFollowRegister is ISemanticSBT {
/**
* 部署follow合约
* @param addr 接受Follow合约的地址
* @return tokenId
*/
function deployFollowContract(address addr) external returns (uint256);
/**
* 查询地址的Follow合约地址
* @param owner Follow合约的地址持有者
* @return contractAddress Follow合约地址
*/
function ownedFollowContract(address owner) external view returns (address);
}
```
### Follow
```solidity
interface IFollow is ISemanticSBT {
/**
* 初始化合约，由FollowRegister进行调用
*/
function initialize(
address owner,
address minter,
string memory name_,
string memory symbol_,
string memory baseURI_,
string memory schemaURI_,
string[] memory classes_,
Predicate[] memory predicates_
) external;
/**
* 关注
* @return tokenId
*/
function follow() external returns (uint256);
/**
* 取消关注
* @return tokenId
*/
function unfollow() external returns (uint256);
/**
* 查询是否关注
* @return isFollowing 是否关注当前合约的owner
*/
function isFollowing(address addr) external view returns (bool);
}
```
### 合约实现说明
FollowRegister作为工厂合约、注册中心和路由合约，业务逻辑包含：
* deployFollowContract 部署Follow合约
* ownedFollowContract 查找地址所持有的Follow合约
Follow作为实际记录用户follow关系的合约，每个用户都有属于自己的Follow合约，当有粉丝follow了该用户，会在用户的Follow合约mint一个token给到粉丝。
* follow 粉丝会在被关注的用户Follow合约上mint一个token
* unfollow 粉丝取消关注，将原来的token销毁
完整的合约代码可访问：
* [FollowRegister](https://github.com/relationlabs/semanticSBT/blob/main/contracts/template/FollowRegister.sol)
* [Follow](https://github.com/relationlabs/semanticSBT/blob/main/contracts/template/Follow.sol)
---
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