ActiveModelSerializer：如何为自定义属性添加关联？答案

【问题标题】：ActiveModelSerializer: how to add association to custom attribute?ActiveModelSerializer：如何为自定义属性添加关联？
【发布时间】：2020-04-11 12:42:43
【问题描述】：

我有一个带有自定义属性的序列化程序，我需要包含与该自定义属性的关联，但无法弄清楚：

def dependent_integrations
  object.integrations.includes(:service_integrations).where(service_integrations: { master: false}).map do |integration|
    # this.integration.organization_integrations ===> I need to include organization_integrations into to integration object for serializer
  end
end

并为代码获取此 JSON：

"dependent_integrations": [
                {
                    "id": 2,
                    "name": "Confluence Cloud",
                    "key": "confluence-cloud",
                    "description": "blablaabla",
                    "vendor": "Atlassian",
                    "active": true,
                    "created_at": "2020-04-08T18:16:01.000Z",
                    "updated_at": "2020-04-08T18:16:03.000Z",
                    "custom": false
                },
            ]
        },

但我需要获取以下包含组织集成的 JSON：

"dependent_integrations": [
                {
                    "id": 2,
                    "name": "Confluence Cloud",
                    "key": "confluence-cloud",
                    "description": "blablaabla",
                    "vendor": "Atlassian",
                    "active": true,
                    "created_at": "2020-04-08T18:16:01.000Z",
                    "updated_at": "2020-04-08T18:16:03.000Z",
                    "custom": false,
                    "organization_integrations": [
                        {
                           id: 1,
                           .......
                        },
                        {
                           id: 2,
                           .......
                        }
                    ]
                },
            .........
            ]
        },

【问题讨论】：

标签： ruby-on-rails active-model-serializers

【解决方案1】：

尝试在渲染方法中使用include 选项。

def your_action
  # ...
  render(
    :json,
    include: 'parent_model.integrations.service_integrations',
    # ...
  )
end

【讨论】：

【解决方案2】：

您想要的是在您的序列化程序中呈现一个关联。您需要做的是为您正在渲染的每个模型使用不同的序列化程序。请注意，您没有指定您使用的 Rails 版本，因此以下代码可能无法正常工作

# your serializer
def dependent_integrations
  ActiveModel::Serializer::CollectionSerializer.new(integrations, each_serializer: IntegrationSerializer).as_json
end

private

def integrations
  object.integrations.includes(:service_integrations).where(service_integrations: { master: false })
end

# IntegrationSerializer
class IntegrationSerializer < ActiveModel::Serializer
  attributes :id, :name, :key, :description, :vendor, :created_at, :updated_at, :custom, :organization_integrations

  def organization_integrations
    ActiveModel::Serializer::CollectionSerializer.new(object.organization_integrations, each_serializer: OrganizationIntegrationSerializer).as_json
  end
end

# OrganizationIntegrationSerializer
class OrganizationIntegrationSerializer
  attributes :id # ...
end

【讨论】：