issue-243-root-default-values.cpp

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#include <iostream>
#include <nlohmann/json-schema.hpp>
 
using nlohmann::json;
using nlohmann::json_uri;
using nlohmann::json_schema::json_validator;
 
static const json root_default = R"(
{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "properties": {
        "width": {
            "type": "integer"
        }
    },
    "default": {
        "width": 42
    }
})"_json;
 
int main(void)
{
    json_validator validator{};
 
    validator.set_root_schema(root_default);
 
    {
        json nul_json;
        if (!nul_json.is_null()) {
            return 1;
        }
 
        const auto default_patch = validator.validate(nul_json);
 
        if (default_patch.is_null()) {
            std::cerr << "Patch is null but should contain operation to add defaults to root" << std::endl;
            return 1;
        }
 
        const auto actual = nul_json.patch(default_patch);
        const auto expected = R"({"width": 42})"_json;
        if (actual != expected) {
            std::cerr << "Patch of defaults is wrong for root schema: '" << actual.dump() << "' instead of expected '" << expected.dump() << "'" << std::endl;
        }
    }
 
    return 0;
}