问题
I have Joi schema and want to add a custom validator for validating data which isn't possible with default Joi validators.
Currently, I'm using the version 16.1.7 of Joi
const method = (value, helpers) => {
// for example if the username value is (something) then it will throw an error with flowing message but it throws an error inside (value) object without error message. It should throw error inside the (error) object with a proper error message
if (value === "something") {
return new Error("something is not allowed as username");
}
// Return the value unchanged
return value;
};
const createProfileSchema = Joi.object().keys({
username: Joi.string()
.required()
.trim()
.empty()
.min(5)
.max(20)
.lowercase()
.custom(method, "custom validation")
});
const { error,value } = createProfileSchema.validate({ username: "something" });
console.log(value); // returns {username: Error}
console.log(error); // returns undefined
But I couldn't implement it the right way. I read Joi documents but it seems a little bit confusing to me. Can anyone help me to figure it out?
回答1:
Your custom method must be like this:
const method = (value, helpers) => {
// for example if the username value is (something) then it will throw an error with flowing message but it throws an error inside (value) object without error message. It should throw error inside the (error) object with a proper error message
if (value === "something") {
return helpers.error("any.invalid");
}
// Return the value unchanged
return value;
};
Docs:
https://github.com/hapijs/joi/blob/master/API.md#anycustommethod-description
Output for value :
{ username: 'something' }
Output for error:
[Error [ValidationError]: "username" contains an invalid value] {
_original: { username: 'something' },
details: [
{
message: '"username" contains an invalid value',
path: [Array],
type: 'any.invalid',
context: [Object]
}
]
}
回答2:
const Joi = require('@hapi/joi');
Joi.object({
password: Joi
.string()
.custom((value, helper) => {
if (value.length < 8) {
return helper.message("Password must be at least 8 characters long")
} else {
return true
}
})
}).validate({
password: '1234'
});
回答3:
This is how I validated my code, have a look at it and try to format yours
const busInput = (req) => {
const schema = Joi.object().keys({
routId: Joi.number().integer().required().min(1)
.max(150),
bus_plate: Joi.string().required().min(5),
currentLocation: Joi.string().required().custom((value, helper) => {
const coordinates = req.body.currentLocation.split(',');
const lat = coordinates[0].trim();
const long = coordinates[1].trim();
const valRegex = /-?\d/;
if (!valRegex.test(lat)) {
return helper.message('Laltitude must be numbers');
}
if (!valRegex.test(long)) {
return helper.message('Longitude must be numbers');
}
}),
bus_status: Joi.string().required().valid('active', 'inactive'),
});
return schema.validate(req.body);
};
来源:https://stackoverflow.com/questions/58425499/how-to-add-custom-validator-function-in-joi