Codeigniter producing array inside database result - php

Question

First off, i tried searching the internet for a solution. But i dont really know what to search for as i dont have the right words for it. Maybe someone could point me to an answer already given.
So here is my "problem":
I have 3 tables in my database: user, task, user_task.
user contains users ofcourse. task contains tasks. And user_task is a relation table. It contains an id of a task and an id of a user. (One task can have multiple users, thats why i do it this way.)
The thing i want to do is simple. I want to get a list of all tasks and for each task the users assigned to it.
Something like this:
Task id: 1, name: do dishes, users: bob, liam.
As far as i came i only got to print a task twice if there were 2 users assigned to it. I got so far, by using a mysql query. Not really CI specific.
The query returns a result() with 2 rows, 1 for the task with the user bob and 1 for the same task with the user liam.
array{
array{
task_id = "1",
name = "do dishes",
user = "bob"
}
array{
task_id = "1",
name = "do dishes",
user = "liam"
}
array{
task_id = "2",
name = "vacuum",
user = "liam"
}
array{
task_id = "3",
name = "Take out thrash",
user = "liam"
}
array{
task_id = "3",
name = "Take out thrash",
user = "bob"
}
}
What i want to get is a result with 1 row containing the task and within that row i want an array with each name of the users assigned to it.
array{
array{
task_id = "1",
name = "do dishes",
user = array( "bob", "liam" )
}
array{
task_id = "2",
name = "vacuum",
user = array( "liam" )
}
array{
task_id = "3",
name = "Take out thrash",
user = array( "liam", "bob" )
}
}
Is there any way to achieve this? Within CI and/or MySQL?
I hope you guys can help me, if i am a bit unclear feel free to ask some specifications.
And as i said: if there is already an answer anywhere, please point me to it!
Thanks in advance!
Cheers.

Answer 1

No, there isn't any option in CI Active Records to achieve that.
You have to loop your result.
<?php
$result = array(
array(
'task_id' => 1,
'name' => 'do dishes',
'user' => 'bob'
),
array(
'task_id' => 1,
'name' => 'do dishes',
'user' => 'liam'
),
array(
'task_id' => 2,
'name' => 'vacuum',
'user' => 'liam'
),
array(
'task_id' => 3,
'name' => 'Take out thrash',
'user' => 'liam'
),
array(
'task_id' => 3,
'name' => 'Take out thrash',
'user' => 'bob'
),
);
function get_arrayvalues_bykeyvalue($array, $key, $key2, $v2)
{
$ret = array();
foreach($array as $arr)
{
foreach($arr as $k => $v)
{
if($arr[$key2] == $v2)
{
if($k == $key)
$ret[] = $v;
}
}
}
$u = array_unique($ret);
return (sizeof($u) == 1) ? $u[0] : $u;
}
$res = array();
foreach($result as $arr)
{
foreach($arr as $k => $v)
{
if($k == 'user')
$res[$arr['task_id']][$k] = get_arrayvalues_bykeyvalue($result, $k, 'task_id', $arr['task_id']);
else
$res[$arr['task_id']][$k] = $v;
}
}
print_r($res);
Output:
Array
(
[1] => Array
(
[task_id] => 1
[name] => do dishes
[user] => Array
(
[0] => bob
[1] => liam
)
)
[2] => Array
(
[task_id] => 2
[name] => vacuum
[user] => liam
)
[3] => Array
(
[task_id] => 3
[name] => Take out thrash
[user] => Array
(
[0] => liam
[1] => bob
)
)
)
Demo:
http://3v4l.org/2E9nP

Answer 2

Lets assume your data has inside $results;
First make a function which will check task id already inside the new result array.if exists return the index else return flase
function get_index($array,$task_id)
{
foreach($array as $index=>$a)
{
if($a['task_id']==$task_id)
{
return $index;
}
}
return false;
}
Now write follwing code to get your desired result inside $new_result
$new_result=array();//this will contains your desired result
foreach($results as $key=>$result)
{
$index=get_index($new_result,$result['task_id']);
if($index===false)
{
$new_result[]=array('task_id'=>$result['task_id'],'name'=>$result['name'],'users'=>array($result['user']));
}
else
{
$new_result[$index]['users'][]=$result['user'];
}
}
print_r($new_result);//this will output your desired result.

Answer 3

I don't have your model, but how I see it, you can use group_concat
Model :
$this->db->select('t.id_task, t.name, GROUP_CONCAT(u.name SEPARATOR "-") as users')
->from('tasks t')
->join('users_task ut', 't.id_task = ut.id_taks')
->join('user u', 'u.id_user = ut.id_user')
->group_by(t.id_task);
$query = $this->db->get();
return $query->result();
/*Result expected :
Array
(
[1] => Array
(
[task_id] => 1
[name] => do dishes
[users] => "John-Peter"
)
[2] => Array
(
[task_id] => 2
[name] => vacuum
[users] => "Mary-Bob"
)
) */
After that, a simple explode should do the trick in your controller.
Controller :
$tasks = $this->my_model->getTasks();
foreach($tasks as $t)
{
$t->users = explode("-", $t->users);
}