Lua字段校验：必填与类型的批量检查

-- 错误：逐字段堆 if，字段越加越长
if data.name == nil or data.name == "" then
    fail("name")
end
if type(data.level) ~= "number" then
    fail("level")
end

local RULES = {
    name = function(v)
        return type(v) == "string" and #v > 0
    end,
    level = function(v)
        return type(v) == "number" and v >= 1
    end,
}
local function validate(data)
    for k, check in pairs(RULES) do
        if not check(data[k]) then
            return false, k
        end
    end
    return true
end