填充 ruby​​ 散列：- 通过具有数组值的散列的散列

Question

我的数据库响应如下所示：

response = [
{id: 1, name: Kassandra, group: Sparta, role: Mercenary}
{id: 2, name: Alexios, group: Sparta, role: Mercenary}
{id: 3, name: Herakles, group: Athens, role: Champion}
]

我的方法：

def get_group_details
  grouped_details = []

  response.each do |key|
  key['group'] = key
  grouped_details.push(key)
  end

end

这会导致stack_level_too_deep错误，看起来我相信它会导致无限循环......我试图操纵响应以发送到 UI：

 response: [
   Mercenary: {
         [{id: 1, name: Kassandra, group: Sparta, role: Mercenary}, {id: 2, name: Alexios, group: Sparta, role: Mercenary}]
}
  Champion: [{id: 3, name: Herakles, group: Athens, role: Champion}]
]

我错过了什么？

Answer 1

您可以使用Enumerable#group_by根据特定键的值对哈希进行分组：

response.group_by { |h| h[:role] }
# =>
{
  "Mercenary": [
    {
      "id": 1,
      "name": "Kassandra",
      "group": "Sparta",
      "role": "Mercenary"
    },
    {
      "id": 2,
      "name": "Alexios",
      "group": "Sparta",
      "role": "Mercenary"
    }
  ],
  "Champion": [
    {
      "id": 3,
      "name": "Herakles",
      "group": "Athens",
      "role": "Champion"
    }
  ]
}