twig - 在 for 循环中构建数组

问题描述

is it possible to iteratively fill a twig array with values?

{% for question in questions %}
{% set multipleChoiceArray = [] %}
    {% for multipleChoice in question.multipleChoiceAnswers %}
        {% set multipleChoiceArray = multipleChoiceArray|merge( multipleChoice.answerText )  %}
    {% endfor %}
{% endfor %}

the problem is here multipleChoiceArray|merge(multipleChoice.answerText)

when i try to pass an array for example with key = loop.index like

{% set multipleChoiceArray = multipleChoiceArray|merge({"loop['index']":"multipleChoice['answerText']"})  %}

it works but the array contains the strings "["loop['index']":"multipleChoice['answerText']"]"

when i try to pass variables like :

{% set multipleChoiceArray = multipleChoiceArray|merge({loop.index:multipleChoice.answerText})  %}

exception is : A hash key must be followed by a colon (:). Unexpected token "punctuation" of value "." ("punctuation" expected with value ":")

so i am not able to "push" a value "multipleChoice.answerText" into "multipleChoiceArray"

any hints how that is possible ?i just want to gather all possible answers and later check if answer is in that array and count sth up and display

解决方案

The argument of merge has to be an array or object to merge it with an existing one. So write it as an array with one element.

{% set multipleChoiceAnswerText = multipleChoice.answerText %}
{% set multipleChoiceArray = multipleChoiceArray|merge([multipleChoice.answerText])  %}

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