Pass array with data to ChoiceType (html select) in Symfony v4.2

Question

Introduction

For my personal project i use

• Symfony v4.2
• PHP 7.2.12

Problem

I can not figure out how to make ChoiceType element display IDs and EMAILs as HTML SELECT option values and indexes.

Example

The picture displays current state of html select with data (id and email) from database.

Code

Array of data from database ($this->userChoices)

array:4 [
    0 => array:2 [
        "id" => 7
        "email" => "[email protected]"
    ]
    1 => array:2 [
        "id" => 8
        "email" => "[email protected]"
    ]
    2 => array:2 [
        "id" => 5
        "email" => "[email protected]"
    ]
    3 => array:2 [
        "id" => 6
        "email" => "[email protected]"
    ]
]

What i am getting

<select id="my-select" name="my-select" class="form-control">
    <optgroup label="0">
        <option value="7">7</option>
        <option value="[email protected]">[email protected]</option>
    </optgroup>
    <optgroup label="1">
        <option value="8">8</option>
        <option value="[email protected]">[email protected]</option>
    </optgroup>
    <optgroup label="2">
        <option value="5">5</option>
        <option value="[email protected]">[email protected]</option>
    </optgroup>
    <optgroup label="3">
        <option value="6">6</option>
        <option value="[email protected]">[email protected]</option>
    </optgroup>
</select>

What i want to get

<select id="my-select">
    <option value=""> Please choose an option </option>
    <option value="7">[email protected]</option>
    <option value="8">[email protected]</option>
    <option value="5">[email protected]</option>
    <option value="6">[email protected]</option>
</select>

Relevant part of myChoiceType

->add('selectUser', ChoiceType::class,
    [
        'choices' => $this->userChoices,
        'choice_value' => function ($choice)
        {
            return $choice;
        },
        'choice_label' => function ($value)
        {
            return $value;
        },
        'mapped' => false,
        'expanded' => false,
        'multiple' => false,
    ]
)

Finally

What am i doing wrong?

How to get ChoiceType display data in html select in the manner i want it to?

Thank you for ideas!

Answer 1

According to the docs, the choices value must be a simple key => value array.

The choices option is an array, where the array key is the item's label and the array value is the item's value

You can easily get the choices array you want using this code:

$choices = [];
foreach ($this->userChoices as $choice) {
  $choices[$choice['email']] = $choice['id'];
}

Then use the following initialization code:

->add('selectUser', ChoiceType::class,
    [
        'choices' => $choices,
        'mapped' => false,
        'expanded' => false,
        'multiple' => false
    ]
)

Not that I removed choice_value and choice_label which don't serve any purpose in this case.

Answer 2

Simply pass it as a one dimensional array, with emails as keys, and ids as values.

$choices = [
    '[email protected]' => 7,
    '[email protected]' => 8,
];