英文:
Remove duplicate data from the Twig object and combine it
问题
在我的Twig模板中，我有一个列表，类似这样：
1985 - John
1974 - Lena
1985 - Sandra
1974 - Tom
1985 - Jess
年份可能会重复。所以我需要将我的列表合并成这样：
1985 - John, Sandra, Jess
1974 - Lena, Tom
在Twig模板引擎中是否可以实现这个？
英文:
In my Twig template i have list, something like this:
1985 - John
1974 - Lena
1985 - Sandra
1974 - Tom
1985 - Jess
The year can be duplicated. So i need combine my list like this:
1985 - John, Sandra, Jess
1974 - Lena, Tom
Is it possible to do this in the Twig template engine?
答案1
得分: 2
在Twig中，我们可以使用merge过滤器将数据添加到数组中。
复杂的部分：
- 我们必须合并每年的名称，然后将其与主数组合并，年份作为键
- 如果我们尝试将数字用作键，Twig会将键重置为数字（
0，1等）
如果我们有这些数据：
{% set data = [
{"year": 1985, "name": "John"},
{"year": 1974, "name": "Lena"},
{"year": 1985, "name": "Sandra"},
{"year": 1974, "name": "Tom"},
{"year": 1985, "name": "Jess"},
]
%}
我们可以循环遍历它，并创建一个数组，以年份作为键，名称作为值：
{% set groupedData = {} %}
{# 遍历数据 #}
{% for person in data -%}
{# 年份必须转换为字符串，否则在数组中使用数值键 #}
{% set year = "y" ~ person["year"] %}
{% set name = person["name"] %}
{% if year not in groupedData|keys %}
{# 年份在数组中不存在，添加一个带有年份和一个名称的数组 #}
{% set groupedData = groupedData|merge({(year): [name]}) %}
{% else %}
{# 年份在数组中存在，将名称添加到此年份的名称数组中 #}
{% set newNamesForYear = attribute(groupedData, year)|merge([name]) %}
{% set groupedData = groupedData|merge({(year): newNamesForYear}) %}
{% endif %}
{% endfor %}
并显示结果：
{% for year, names in groupedData %}
{# 去掉年份中的y并打印名称 #}
{{ year|slice(1) }} - {{ names|join(', ') }}
{% endfor %}
以下是结果：
1985 - John, Sandra, Jess
1974 - Lena, Tom
使用的资源：
英文:
In Twig, we can add data to an array with the merge filter.
The tricky parts:
- we have to merge the names for each year and then merge it to the main array, with the year as the key
- Twig resets the key to a number (
0,1, etc.) if we try to use a number as a key
If we have this data:
{% set data = [
{"year": 1985, "name": "John"},
{"year": 1974, "name": "Lena"},
{"year": 1985, "name": "Sandra"},
{"year": 1974, "name": "Tom"},
{"year": 1985, "name": "Jess"},
]
%}
We can loop over it, and create an array, with each year as the key and the names as values:
{% set groupedData = {} %}
{# Loop over data #}
{% for person in data -%}
{# the year must be casted as a string, otherwise it uses numeric keys in the array #}
{% set year = "y" ~ person["year"] %}
{% set name = person["name"] %}
{% if year not in groupedData|keys %}
{# year doesn't exist in the array, add a key with the year and an array with one name #}
{% set groupedData = groupedData|merge({(year): [name]}) %}
{% else %}
{# year exists in the array, add the name to the array of names for this year #}
{% set newNamesForYear = attribute(groupedData, year)|merge([name]) %}
{% set groupedData = groupedData|merge({(year): newNamesForYear}) %}
{% endif %}
{% endfor %}
And display the result:
{% for year, names in groupedData %}
{# remove the y in the year and print the names #}
{{ year|slice(1) }} - {{ names|join(', ') }}
{% endfor %}
Here is the result:
1985 - John, Sandra, Jess
1974 - Lena, Tom
Resources used:
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