我想在会议图块，日期和注册日期下面的页面中显示。
为此，我有一个public function index() {
$user = Auth::user();
$registrations = $user->with('registrations.congress');
return view('users.index', compact('user', 'registrations'));
}
，它具有index（）方法，该方法应该在用户的会议中进行注册，然后从每次注册中获取该会议的会议详细信息，以便可以在查看每次代表大会登记的会议名称，日期和登记日期。
我有下面的代码但是没有用。你知道问题出在哪里吗？
<div class="tab-content bg-white" id="myTabContent">
<div class="tab-pane fade show active clearfix" id="generalInfo" role="tabpanel" aria-labelledby="home-tab">
<form method="post" action="{{route('user.updateGeneralInfo')}}" class="clearfix">
{{csrf_field()}}
...
</form>
</div>
<div class="tab-pane clearfix fade" id="myTickets" role="tabpanel" aria-labelledby="contact-tab">
...
@foreach($registration as $reg)
<ul>
<li>here is to show congress title</li>
<li>here is to show congress date</li>
<li>here is to show registration date</li>
...
</ul>
@endforeach
</div>
</div>
//我想要显示大会标题，日期和注册日期的页面
class Congress extends Model
{
// A conference has many registration types
public function ticketTypes(){
return $this->hasMany('App\TicketType', 'congress_id');
}
public function registrations(){
return $this->hasMany('App\Registration', 'congress_id');
}
}
// RegistrationModel
class Registration extends Model
{
// a registration has one user that do the registration (main_participant_id)
public function customer(){
return $this->belongsTo('App\User');
}
public function congress(){
return $this->belongsTo('App\Congress');
}
}
// TicketTypeModel
class TicketType extends Model
{
public function congress(){
return $this->belongsTo('App\Congress');
}
}
问题的相关模型：
//国会模型
registrations table: id, status, congress_id, created_at
congresses table: id, name, created_at,...
ticket type table:id, name, congres_id, created_at, ....
表格结构：
#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <iterator>
#include <assert.h>
template<class InputIt1, class InputIt2,
class OutputIt1, class OutputIt2, class OutputIt3,
class Compare>
OutputIt3 decompose_connections(InputIt1 first1, InputIt1 last1,
InputIt2 first2, InputIt2 last2,
OutputIt1 result1, OutputIt2 result2,
OutputIt3 result3, Compare comp)
{
while (first1 != last1 && first2 != last2) {
if (comp(*first1, *first2)) {
*result1++ = *first1++;
} else if (comp(*first2, *first1)) {
*result2++ = *first2++;
} else {
*result3++ = *first1++;
++first2;
}
}
std::copy(first1, last1, result1);
std::copy(first2, last2, result2);
return result3;
}
int main() {
// Simply as an example
std::vector<std::string> A1, A2, A3, B1, B2, B3;
std::vector<std::vector<std::string>> vecA, vecB, diff, del, red;
std::string strA1_1 = "1101";
std::string strA1_2 = "11";
std::string strA1_3 = "110111";
std::string strA2_1 = "1111";
std::string strA2_2 = "10";
std::string strA2_3 = "111110";
std::string strA3_1 = "1001";
std::string strA3_2 = "01";
std::string strA3_3 = "100101";
std::string strB1_1 = "1001";
std::string strB1_2 = "11";
std::string strB1_3 = "100111";
std::string strB2_1 = "0111";
std::string strB2_2 = "10";
std::string strB2_3 = "011110";
std::string strB3_1 = "1001";
std::string strB3_2 = "01";
std::string strB3_3 = "100101";
A1.push_back(strA1_1); A1.push_back(strA1_2); A1.push_back(strA1_3);
A2.push_back(strA2_1); A2.push_back(strA2_2); A2.push_back(strA2_3);
A3.push_back(strA3_1); A3.push_back(strA3_2); A3.push_back(strA3_3);
B1.push_back(strB1_1); B1.push_back(strB1_2); B1.push_back(strB1_3);
B2.push_back(strB2_1); B2.push_back(strB2_2); B2.push_back(strB2_3);
B3.push_back(strB3_1); B3.push_back(strB3_2); B3.push_back(strB3_3);
vecA.push_back(A1); vecA.push_back(A2); vecA.push_back(A3);
vecB.push_back(B1); vecB.push_back(B2); vecB.push_back(B3);
// end example
auto compare = [](std::vector<std::vector<std::string>>::const_reference lhs,
std::vector<std::vector<std::string>>::const_reference rhs)
{
assert(lhs.size() && rhs.size());
return lexicographical_compare(lhs.begin(), prev(lhs.end(), 2),
rhs.begin(), prev(rhs.end(), 2)
);
};
std::sort(vecA.begin(), vecA.end());
std::sort(vecB.begin(), vecB.end());
decompose_connections(vecA.begin(), vecA.end(),
vecB.begin(), vecB.end(),
std::back_inserter(diff),
std::back_inserter(del),
std::back_inserter(red),
compare);
std::cout << "diff: " << endl;
for (int i = 0; i < diff.size(); i++) {
for (int j = 0; j < diff[i].size(); j++) {
std::cout << diff[i][j] << " ";
}
std::cout << std::endl;
}
std::cout << std::endl;
std::cout << "del: " << endl;
for (int i = 0; i < del.size(); i++) {
for (int j = 0; j < del[i].size(); j++) {
std::cout << del[i][j] << " ";
}
std::cout << std::endl;
}
std::cout << std::endl;
std::cout << "red: " << endl;
for (int i = 0; i < red.size(); i++) {
for (int j = 0; j < red[i].size(); j++) {
std::cout << red[i][j] << " ";
}
std::cout << std::endl;
}
std::cout << std::endl;
}
答案 0 :(得分：0)
尝试foreach $registrations代替$registration，因为您传递给View
答案 1 :(得分：0)
问题在于：
$registrations = $user->with('registrations.congress');
^这将返回一个查询构建器，而不是关系的结果。
你可能想要的是：
$registrations = $user->registrations()->with('congress')->get();
这假定User模型具有名为registrations的关系。
此外，您正在传递$registrations，但正在循环$registration，正如@Muabazalm注意到的那样。
下次，您还会收到错误信息，这将会很有帮助。