在Twig中过滤和拼接数组 [英] Filtering and splicing an array in Twig
问题描述
我有一个用户记录数组(从数据库查询中索引为0),每个用户记录包含一个字段数组(按字段名称索引).例如:
I have an array of user records (0 indexed, from a database query), each of which contains an array of fields (indexed by field name). For example:
Array
(
[0] => Array
(
[name] => Fred
[age] => 42
)
[1] => Array
(
[name] => Alice
[age] => 42
)
[2] => Array
(
[name] => Eve
[age] => 24
)
)
在我的Twig模板中,我想获取age
字段为42的所有用户,然后将这些用户的name
字段作为数组返回.然后,我可以将该数组传递给join(<br>)
以每行打印一个名称.
In my Twig template, I want to get all the users where the age
field is 42 and then return the name
field of those users as an array. I can then pass that array to join(<br>)
to print one name per line.
例如,如果年龄是42岁,我希望Twig输出:
For example, if the age was 42 I would expect Twig to output:
Fred<br>
Alice
这是否可以在Twig中直接使用,还是需要编写自定义过滤器?我不确定如何用几个词来描述我想要的内容,因此可能是其他人编写了过滤器,但我无法通过搜索找到它.
Is this possible to do in Twig out of the box, or would I need to write a custom filter? I'm not sure how to describe what I want in a couple of words so it may be that someone else has written a filter but I can't find it by searching.
推荐答案
最终解决方案是到目前为止已发布内容的组合,并进行了一些更改.伪代码为:
Final solution was a mix of what has been posted so far, with a couple of changes. The pseudocode is:
for each user
create empty array of matches
if current user matches criteria then
add user to matches array
join array of matches
小枝代码:
{% set matched_users = [] %}
{% for user in users %}
{% if user.age == 42 %}
{% set matched_users = matched_users|merge([user.name|e]) %}
{% endif %}
{% endfor %}
{{ matched_users|join('<br>')|raw }}
merge
仅接受array
或Traversable
作为参数,因此您必须通过将user.name
字符串括在[]
中来将其转换为单元素数组.您还需要转义user.name
并使用raw
,否则<br>
将转换为<br>
(在这种情况下,我希望用户名转义,因为它来自不受信任的来源,而换行符是字符串我已指定).
merge
will only accept an array
or Traversable
as the argument so you have to convert the user.name
string to a single-element array by enclosing it in []
. You also need to escape user.name
and use raw
, otherwise <br>
will be converted into <br>
(in this case I want the user's name escaped because it comes from an untrusted source, whereas the line break is a string I've specified).
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