[luci] Please help with validating unique vlaues

[Jo-Philipp Wich]

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Hi.

> I have a requirement to validate some input data to make sure that it
> is unique, unfortunately I don't seem to be able to see a way forward.

You can define a validate function for a whole section, this allows you
to validate all fields within it. It gets self and the section id as
parameters.

The fields are stored in a key->value table within self.fields, you can
access their :formvalue() member function to obtain the values you want.

Try something like that:

m = Map(...)

s = m:section(...)

function s.validate(self, sectionid)
	local field, obj
	local values = { }

	for field, obj in pairs(self.fields) do
		local fieldval = obj:formvalue(sectionid)
		if not values[fieldval] then
			values[fieldval] = true
		else
			return nil  -- raise error
		end
	end

	return sectionid  -- signalize success
end


~ JoW
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