.get() throws error if used with userdefined structs in unordered_map

[MagicTripz]

• What is the issue you have?
  I'm trying to save a unordered_map<int,struct> to a json and after that convert it back to the same unordred_map. Saving it works fine, the output is as expected but when i try to load the map from the given json this error is thrown : "JSON_THROW(type_error::create(304, "cannot use at() with " + std::string(type_name())));" (line 15402)."
  If i simply overlooked something then im very sorry to bother.

• Please describe the steps to reproduce the issue. Can you provide a small but working code example?

struct Data
{
	bool bool1;
	bool bool2;
};

inline void from_json(const json& j, Data& config)
{
	config.bool1 = j.at("bool1").get < bool >();
	config.bool2 = j.at("bool2").get < bool >();
}
inline void to_json(json& j, const Data& config)
{
	j = json{
		{ "bool1", config.bool1 },
		{ "bool2", config.bool2 }
	};
}
void codeexample()
{
	//oversimplified example
	std::string key1, key2;//give them some random value 
	key1 = "fine1";
	key2 = "fine2";
	int integerofchoice = 1;
	std::unordered_map<int, Data> map =
	{
		{1,{true,false}},
		{2,{true,true}},
	};
	//saving it

	json Cfg;
	Cfg[key1][key2].push_back(map[integerofchoice]);
	//output is fine

       map[integerofchoice] = Cfg[key1][key2].get<Data>();//crashes 
        //step by step for debugging
	auto fine = Cfg.at(key1);
	auto fine2 = fine.at(key2);
	auto crash = fine2.at("bool1").get<bool>();



}

• What is the expected behavior?
  .get<>() function should return bool1 and bool2 as from__json() is defined

• And what is the actual behavior instead?
  Throws the error and crashes

• Which compiler and operating system are you using? Is it a supported compiler?
  Msvc win10 newest build

• Did you use a released version of the library or the version from the develop branch?
  release version 3.5.0

[nlohmann]

Maps whose keys are not strings are converted to an array of pairs, because JSON objects must be strings. This seems to be the issue here. 

[nlohmann]

When you investigate Cfg after the push_back, you have the following value:

{"fine1":{"fine2":[{"bool1":true,"bool2":false}]}}

(Note the array at key fine2.)

This code then works:

auto d = Cfg[key1][key2][0].get<Data>();
map[integerofchoice] = d;

(Note the [0] to access the array element.)

Also, this works:

map[integerofchoice] = Cfg[key1][key2][0];

or this:

map[integerofchoice] = Cfg[key1][key2][0].get<Data>()

[MagicTripz]

It now works as expected, thank you very much! I overlooked the fact that the push_back made it an array, thought it would be the same as "=" my bad