问题描述
我一直在尝试与Joi(旧版本14.3.1)一起创建架构,但不幸的是,我被困住了。我尝试了多种定义模式的方法,但是结果总是伴随着模式定义错误。
这是我的架构定义:
const allowedUser = {
admin: 'ADMIN',normal: 'norMAL'
};
const schema = validator
.object()
.keys({
user: validator.any().valid(Object.values(allowedUser)).required(),context: validator.object().default({})
})
.when('user',{
is: allowedUser.admin,then: validator.when(validator.object({ context: validator.exist() }),{
then: validator.object().keys({
session: validator.string().required()
})
})
})
.when('user',{
is: allowedUser.normal,{
then: validator.object().keys({
id: validator.string().required()
})
})
});
我尝试过的另一个模式定义:
const schema = validator.object().keys({
user: validator.any().valid(Object.values(allowedUser)).required(),context: validator
.object()
.when('user',{
is: allowedUser.admin,then: validator.when('context',{
is: validator.exist(),then: validator.object().keys({
session: validator.string().required()
})
})
})
.when('user',{
is: allowedUser.normal,then: validator.object().keys({
id: validator.string().required()
})
})
})
.default({})
});
所以架构的条件如下:
- 对于
user
,类型为ADMIN
:如果定义了context
属性,则它应包含属性session
。如果context
属性未定义,则应将默认设置为{}
- 对于
user
,类型为norMAL
:如果定义了context
属性,则它应包含属性id
。如果context
属性未定义,则应将值默认设置为{}
- 最明显的情况是,如果
context
属性包含未知属性,它也会失败
AssertionError [ERR_ASSERTION]: Cannot merge type object with another type: alternatives
我的最小示例代码如下:
const validator = require('joi');
const allowedUser = {
admin: 'ADMIN',normal: 'norMAL'
};
const bodyWhenUndefined = {
user: 'ADMIN',message: 'Hi'
};
const bodyWhenValidDefined = {
user: 'ADMIN',message: 'Hi'
};
const bodyWhenDefinedEmpty = {
user: 'ADMIN',message: 'Hi 2',context: {}
};
const bodyWhenDefinedWrong = {
user: 'admin',message: 'Hi 3',context: {abc: 'wrong property'}
};
const schema = validator
.object()
.keys({
user: validator.any().valid(Object.values(allowedUser)).required(),{
then: validator.object().keys({
id: validator.string().required()
})
})
});
const resultSuccess = validator.validate(bodyWhenValidDefined,schema);
console.log("This is with success in validation",resultSuccess.value);
const result = validator.validate(bodyWhenUndefined,schema);
console.log("This is with default context property",result.value);
const resultWithEmptyError = validator.validate(bodyWhenDefinedEmpty,schema);
console.log("This should come with error with required property session",resultWithEmptyError.error);
const resultWithWrongProp = validator.validate(bodyWhenDefinedWrong,resultWithWrongProp.error);
我已经创建了一个有效的REPL小提琴here,可以帮助您告诉我我做错了什么地方。
解决方法
因此,感谢REPL找到了here。我想到了如何基于同级属性值定义嵌套模式的想法。您只需为对象提供then
条件并定义所需的属性。这是工作模式:
const schema = validator.object().keys({
user: validator.any().valid(Object.values(allowedUser)).required(),message: validator.string(),context: validator
.object()
.when('user',{
is: allowedUser.admin,then: {
session: validator.required()
}
})
.when('user',{
is: allowedUser.normal,then: {
id: validator.required()
}
})
.default({})
});