分组并删除重复项

Question

我正在尝试发布从一组集合生成的列表。集合包含特化和subSpecialisation（它是一个数组）。我可以生成列表，但我无法弄清楚如何删除重复项并正确匹配subSpecialisation与专业化。

EG。

收集1

 "specialisation": "Accounting Firm",
  "subSpecialisation": [
    "Audit, Assurance & Risk",
    "Business Services & Private Clients",
    "Corporate Finance, Recovery & Transactions"
  ]

收集2

"specialisation": "Accounting in Industry",
  "subSpecialisation": [
    "Financial Accounting & Control",
    "Management Reporting & Budgeting"
  ]

收集3

"specialisation": "Accounting Firm",
  "subSpecialisation": [
    "Audit, Assurance & Risk",
    "Tax"
  ]

路径：template.js

specialisation() {
  let specialisations = Specialisation.find( {} );

  if (specialisations != null) {
    return specialisations;
  }
}

路径：template.html

{{#each specialisation}}
  {{this.specialisation}}
  {{#each subSpecialisation}}
    {{this}}
  {{/each}}
{{/each}}

修改 - 最终结果

Accounting Firm
 - Audit, Assurance & Risk
 - Tax
 - Business Services & Private Clients
 - Corporate Finance, Recovery & Transactions
Accounting in Industry
 - Financial Accounting & Control
 - Management Reporting & Budgeting