Enable to pass "now" in date.min and date.max

[aymericbeaumet]

It is not currently possible to validate a date relatively to the
current time. For example, the following schema will always validate
relatively to the time of the schema object allocation:

var schema = {
  date: Joi.date().min(new Date())
};

This patch addresses this issue by adding a new 'now' placeholder.
It dynamically computes the current time on-the-fly at each comparison.
Allowing to always compare relatively to the current time.

var schema = {
  // Ensure the date field cannot represent a past date
  date: Joi.date().min('now')
};

[rlidwka]

hmm... how about adding "a hour ago" as well?

I mean, it should really be a function imho.

[aymericbeaumet]

I agree it could be a function. I wanted to keep it simple. The thing is I remember an issue where Eran didn't wanted to accept custom functions (cannot find it).

Do you know any JS library to transform relative date (a year ago, in 2 minutes) in Date objects?

[Marsup]

I've merged this as is for the time being but I agree with @rlidwka, we need to come up with a better solution.
We could always include chrono which does this very well but how many "special cases" will Joi have to handle ?

Just to lay the state of things from what I gathered, Joi needs to be able to :

• validate object
• generate documentation
• stay friendly with joi validation generators like enjoi which is pure json

I'm thinking about ways to achieve this but if you already have an idea feel free to open an issue @rlidwka :)

[rlidwka]

I'm thinking about ways to achieve this but if you already have an idea feel free to open an issue @rlidwka :)

I already have an idea. There is no other way, really.

[Marsup]

That answers to only one of those 3 conditions.

[rlidwka]

That answers to only one of those 3 conditions.

It answers to all three. Custom function can validate stuff, and it can be serialized. Documentation might require another custom function to generate it, but there is nothing unsolvable there.

[Marsup]

Never said it was, just saying it's more tricky than "just support functions and be done with it".

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