Eager loading from questions table, with the corresponding answers - php

Question

Im trying to figure out how i can fetch "questions" from my questions table, and at the same time fetch the corresponding answers, or in my specific case I have called them choices.
Currently I´m fetching it like this:
public static function getQuestion($id)
{
$sql = "SELECT * FROM questions WHERE id = :id";
$query = $database->prepare($sql);
$query->execute(array(':id' => $id));
if($query->rowCount() == 1){
return $query->fetch();
}
return false;
}
public static function getChoices($id)
{
$sql = "SELECT * FROM choices WHERE question_id = :id";
$query = $database->prepare($sql);
$query->execute(array(':id' => $id));
return $query->fetchAll();
}
So I´m doing two (2) queries, first I'm fetching the question, then I'm fetching the question choices. The result in JSON format is this:
{
"question": {
"id": "12",
"content": "asdasd",
"source": "asd",
"image_url": "156ebc3206212c_qijpmnklohgfe.jpeg",
"lastmodified": "2016-03-18 09:58:08",
"quiz_id": "6"
},
"answers": [
{
"id": "45",
"content": "Ja",
"correct": "0",
"question_id": "12"
},
{
"id": "46",
"content": "nej",
"correct": "0",
"question_id": "12"
},
{
"id": "47",
"content": "inte",
"correct": "0",
"question_id": "12"
},
{
"id": "48",
"content": "kanske ",
"correct": "1",
"question_id": "12"
}
]
}
But he "correct" way should probably be that the answers (choices) is nested inside the question:
{
"question": {
"id": "12",
"content": "asdasd",
"source": "asd",
"image_url": "156ebc3206212c_qijpmnklohgfe.jpeg",
"lastmodified": "2016-03-18 09:58:08",
"quiz_id": "6",
"answers": [
{
"id": "45",
"content": "Ja",
"correct": "0",
"question_id": "12"
},
{
"id": "46",
"content": "nej",
"correct": "0",
"question_id": "12"
},
{
"id": "47",
"content": "inte",
"correct": "0",
"question_id": "12"
},
{
"id": "48",
"content": "kanske ",
"correct": "1",
"question_id": "12"
}
]
}
}
My question:
How do I join (or eager load) the choices to the question?

Answer 1

You could write a 3rd function that pulls both using a join.
$sql = "SELECT
q.id as question_id, q.content, q.source, q.image_url, q.lastmodified, q.quiz_id,
c.id AS answer_id, c.content as an_content, c.correct, c.question_id
FROM questions as q
INNER JOIN choices AS c ON q.id = c.question_id
WHERE q.id = :id";

Answer 2

$database = DatabaseFactory::getFactory()->getConnection();
$question = Self::getFraga($id);
$answer = Self::getAnswers($id);
$question->answer = $answer;
return $question;
Produces:
{
"question": {
"id": "12",
"content": "asdasd",
"source": "asd",
"image_url": "156ebc3206212c_qijpmnklohgfe.jpeg",
"lastmodified": "2016-03-18 09:58:08",
"quiz_id": "6",
"answer": [
{
"id": "45",
"content": "Ja",
"correct": "0",
"question_id": "12"
},
{
"id": "46",
"content": "nej",
"correct": "0",
"question_id": "12"
},
{
"id": "47",
"content": "inte",
"correct": "0",
"question_id": "12"
},
{
"id": "48",
"content": "kanske ",
"correct": "1",
"question_id": "12"
}
]
}
}
Very simpel solution after all