I have an issue to create Joi schema for this input
{
projects: ["*","ABC123","ABC456"]
}
With the input above, it should throw an error.
I did try to use Joi.alternatives() like this
const schema = Joi.object({
projects:
Joi.array()
.items(
Joi.alternatives(
Joi.string().equal('*'),
Joi.string().regex(new RegExp(/^ABC_([0-9]{3,3})$/))
)
)
})
but it appears to allow both ["*"] and ["ABC123","DEF456"] together. I wanted it to be either ["*"] or ["ABC123","DEF456"], else it will be an error.
How can I actually achieve it by using Joi?
You can try something like this:
const schema = Joi.object({
projects: Joi.alternatives(
Joi.array().length(1).items(
Joi.string().equal('*')
),
Joi.array().items(
Joi.string().regex(/^ABC[0-9]{3}$/)
)
)
});
That is, havingh two alternative array schemas instead of having a single array schema with alternative schemas of elements.
The .length(1) is there to reject values like ["*", "*"] if you want to reject arrays like that, but could be omitted otherwise.
Also, the regex could be written in a simpler way so I simplified it, but I guess that it was just an example so that is not so important. What is important though is that i removed the underscore ("_") from the regex, because a regex in your example didn't match values like "ABC123" in your example but e.g. "ABC_123".