我正在使用jsonnet读取由数组组成的值。我想修改该数组中的第一个元素以添加一个值。数据结构如下:
{
"my_value": [
{
"env": "something"
},
{
"var": "bar"
}
]
}
我想为my_value[0]
添加一个值。如何在jsonnet中引用它?
答案 0 :(得分:3)
使用https://jsonnet.org/ref/stdlib.html#mapWithIndex的可能方法如下:
$ cat foo.jsonnet
local my_array = [
{
env: "something",
},
{
var: "bar",
},
];
local add_by_idx(idx) = (
if idx == 0 then { extra: "stuff" } else {}
);
std.mapWithIndex(function(i, v) v + add_by_idx(i), my_array)
$ jsonnet foo.jsonnet
[
{
"env": "something",
"extra": "stuff"
},
{
"var": "bar"
}
]
答案 1 :(得分:3)
您可以将super
与jsonnet的python样式数组切片结合使用:
{
"my_value": [
{
"env": "something"
},
{
"var": "bar"
}
]
}
+
{
"my_value": [
super.my_value[0] + {
"env_2": "something_else"
},
] + super.my_value[1:]
}
结果:
{
"my_value": [
{
"env": "something",
"env_2": "something_else"
},
{
"var": "bar"
}
]
}
答案 2 :(得分:0)
一种IMO更好的方法:将array
转换为object
以便于重载,然后再利用jsonnet通过对其键进行alpha排序来处理对象这一事实:
$ cat foo.jsonnet
local array_a = [
{ env: "something" },
{ var: "bar" },
];
local array_b = [
{},
{ extra: "stuff" },
];
// "Standarize" index key string as "%06d"
local _idx(i) = ("%06d" % [i]);
// Convert array [elem1, elem2, ...] to object as { 000000: elem0, 000001: elem1, ...}
local _to_obj(a) = std.foldl(
function(x, y) x + y,
std.mapWithIndex(function(i, v) { [_idx(i)]: v }, a),
{}
);
local _to_array(obj) = [obj[k] for k in std.objectFields(obj)];
_to_array(std.mergePatch(_to_obj(array_a), _to_obj(array_b)))
$ jsonnet foo.jsonnet
[
{
"env": "something"
},
{
"extra": "stuff",
"var": "bar"
}
]