循环对象数组并在 Laravel PHP 中获取值
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Loop over an array of objects and get values in laravel PHP
提问by Sajid Ahmad
I am working on a QA app where i need to add multiple answers to a question as per requirement dynamically. for this i am sending an object which carry question and the answers like.
我正在开发一个 QA 应用程序，我需要根据要求动态地为一个问题添加多个答案。为此，我发送了一个带有问题和答案的对象。
question={
'question_text':'what is your name',
'answers':[
{'answer_text':'some answer','isCorrect':'1'},
{'answer_text':'some answer','isCorrect':'1'},
{'answer_text':'some answer'} // answer may or may not have isCorrect key
]
}
On server side I have two tables or migrations 1 for Question and 1 for answer. The answer table have three fields question_id, answer_text' andisCorrect'. question_idis the foreign key of question in answer table.
在服务器端，我有两个表或迁移 1 用于问题，1 用于回答。答案表有三个字段 question_id，answer_text' andisCorrect'。question_id是答案表中问题的外键。
to store the objects what i am doing is
存储对象我正在做的是
$question_text=Input::get('question_text');
$answers=Input::get('answers');
$question=new Question;
$question->question_text=$question_text;
$question->save();
foreach($answers as $ans){
$answer=new Answer;
$answer->question_id=$question->id;
$answer->answer_text=$ans->answer_text;
if($answer->isCorrect){
$answer->is_correct=$ans->isCorrect;
}
else{
$answer->is_correct=0;
}
$answer->save();
}
But while iterating there is an error
但是在迭代时出现错误
`production.ERROR: exception 'ErrorException' with message 'Trying to get property of non-object'`
what wrong I am doing here. I am first time working on PHP. I am trying to iterate it like Javascript or Python way. Tell me how can i get the values of answers array object and store them.
我在这里做错了什么。我是第一次使用 PHP。我正在尝试像 Javascript 或 Python 那样迭代它。告诉我如何获取答案数组对象的值并存储它们。
回答by Laurence
You dont seem to be referencing the array variables correctly. This should work:
您似乎没有正确引用数组变量。这应该有效：
foreach($answers as $ans){
$answer=new Answer;
$answer->question_id=$question->id;
$answer->answer_text=$ans['answer_text'];
$answer->is_correct = isset($ans['isCorrect']);
$answer->save();
}
p.s. Im not sure about forEach- I'm suprised it works - but you should probably rename it to foreachto confirm to the normal standards
ps我不确定forEach- 我很惊讶它的工作原理 - 但你可能应该将它重命名为foreach以确认正常标准
