从ansible词典列表中过滤与条件匹配的元素

Question

以下是我的数据的虚构示例。当列表library(ggplot2) library(data.table) # Prepare data # Create continuous data for the x-axis dt[, X := 1:.N] # Define begging of the year break_labels <- dt[, min(X), year] # Plot ggplot(dt, aes(X, d)) + # Use 0.5 to extend colour around the X geom_rect(aes(xmin = X - 0.5, xmax = X + 0.5, ymin = -Inf, ymax = Inf, fill = time)) + geom_point(size = 3) + geom_line(size = 1, linetype = 2) + # Specify wanted colour code scale_fill_manual(values = c("#EDBB99", "#D6EAF8")) + # Specify breaks only for the begging of the year scale_x_continuous(breaks = break_labels$V1, labels = break_labels$year) + labs( x = "Year", y = "Diversity", fill = "Season" ) + theme_classic() 中的任何字典具有名称为mylst.env的键时，我想提取所有客户的名称 我想这可以通过嵌套循环来完成，但无法弄清楚如何实现。

n1

Answer 1

json_query过滤器是完成此类任务的好工具。把头缠起来需要一些时间，但可以尝试一下：

  - set_fact:
      cust_lst: "{{ mylst | json_query(query) }}"
    vars:
      query: "[?env[?name=='n1']].name"

您可以在official documentation上找到更多信息，并且可以无耻地插入blog post

Answer 2

您可以在map列表上使用item.env过滤器来获取mylst中每个元素包含的名称的列表。然后如果该列表中包含关键字“ n1”，则将其添加到final_var中。请看下面

PLAYBOOK：

---
- hosts: localhost
  gather_facts: false
  vars:
    mylst:
    - apiVersion: v1
      name: customer1
      metaData:
          cycles: 10
          ships: 12
      env:
        - name: n1
          value: v1
        - name: n2
          value: v2
    - apiVersion: v1
      name: customer2
      metaData:
          cycles: 10
          ships: 12
      env:
        - name: n1
          value: v1
        - name: n3
          value: v3
    - apiVersion: v1
      name: customer3
      metaData:
          cycles: 10
          ships: 12
      env:
        - name: n3
          value: v1
        - name: n4
          value: v4
    - apiVersion: v1
      name: customer4
      metaData:
          cycles: 10
          ships: 12
      env:
        - name2: n3
          value: v1
        - name2: n4
          value: v4

  tasks:

  - name: prepare var
    set_fact:
      final_var: "{{ final_var | default([]) + [item.name] }}"
    when: '"n1" in {{ item.env | selectattr("name", "defined") | map(attribute="name") | list }}'
    with_items:
    - "{{ mylst }}"

  - name: print var
    debug:
      var: final_var

您会注意到，我在mylst中添加了第四个元素，该元素不包含键=“ name”的属性。在传递给地图过滤器之前，它们将由selectattr("name", "defined"过滤器过滤掉。

输出：

PLAY [localhost] *******************************************************************************************************************************************************************************************************

TASK [prepare var] *****************************************************************************************************************************************************************************************************
[WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: "n1" in {{ item.env | selectattr("name", "defined") | map(attribute="name") | list }}

ok: [localhost] => (item={'apiVersion': 'v1', 'name': 'customer1', 'metaData': {'cycles': 10, 'ships': 12}, 'env': [{'name': 'n1', 'value': 'v1'}, {'name': 'n2', 'value': 'v2'}]})
ok: [localhost] => (item={'apiVersion': 'v1', 'name': 'customer2', 'metaData': {'cycles': 10, 'ships': 12}, 'env': [{'name': 'n1', 'value': 'v1'}, {'name': 'n3', 'value': 'v3'}]})
skipping: [localhost] => (item={'apiVersion': 'v1', 'name': 'customer3', 'metaData': {'cycles': 10, 'ships': 12}, 'env': [{'name': 'n3', 'value': 'v1'}, {'name': 'n4', 'value': 'v4'}]}) 
skipping: [localhost] => (item={'apiVersion': 'v1', 'name': 'customer4', 'metaData': {'cycles': 10, 'ships': 12}, 'env': [{'name2': 'n3', 'value': 'v1'}, {'name2': 'n4', 'value': 'v4'}]}) 

TASK [print var] *******************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "final_var": [
        "customer1",
        "customer2"
    ]
}

PLAY RECAP *************************************************************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

希望这些帮助。

出现2.7.5错误（如下注释所述）

发现此任务正在规避2.7.5错误：

  - name: prepare var
    set_fact:
      final_var: "{{ final_var | default([]) + [item.name] }}"
    when: "'n1' in item.env | selectattr('name', 'defined') | map(attribute='name') | list"
    with_items:
    - "{{ mylst }}"