Json Rails：使用 active_model_serializers 序列化深度嵌套的关联

发布于08月20日

我用Rails 4.2.1和active_model_serializers 0.10.0.rc2

I'm new to API's and chose active_model_serializers because it seems to be becoming the standard for rails (Although I'm not opposed to using RABL or another serializer)

我遇到的问题是，我似乎不能在多级关系中包含各种属性.例如，我有:

Projects

class ProjectSerializer < ActiveModel::Serializer
  attributes                      :id, 
                                  :name,
                                  :updated_at

  has_many                        :estimates, include_nested_associations: true

end

and Estimates

class EstimateSerializer < ActiveModel::Serializer
  attributes                      :id, 
                                  :name, 
                                  :release_version, 
                                  :exchange_rate, 
                                  :updated_at,

                                  :project_id, 
                                  :project_code_id, 
                                  :tax_type_id 

  belongs_to                      :project
  belongs_to                      :project_code
  belongs_to                      :tax_type

  has_many                        :proposals

end

Proposals

class ProposalSerializer < ActiveModel::Serializer
  attributes                      :id, 
                                  :name, 
                                  :updated_at,

                                  :estimate_id

  belongs_to                      :estimate
end

当我打到/projects/1的时候，上面的会产生:

{
  "id": 1,
  "name": "123 Park Ave.",
  "updated_at": "2015-08-09T02:36:23.950Z",
  "estimates": [
    {
      "id": 1,
      "name": "E1",
      "release_version": "v1.0",
      "exchange_rate": "0.0",
      "updated_at": "2015-08-12T04:23:38.183Z",
      "project_id": 1,
      "project_code_id": 8,
      "tax_type_id": 1
    }
  ]
}

However, what I'd like it to produce is:

{
  "id": 1,
  "name": "123 Park Ave.",
  "updated_at": "2015-08-09T02:36:23.950Z",
  "estimates": [
    {
      "id": 1,
      "name": "E1",
      "release_version": "v1.0",
      "exchange_rate": "0.0",
      "updated_at": "2015-08-12T04:23:38.183Z",
      "project": { 
        "id": 1,
        "name": "123 Park Ave."
      },
      "project_code": {
        "id": 8,
        "valuation": 30
      },
      "tax_type": {
        "id": 1,
        "name": "no-tax"
      },
      "proposals": [
        {
          "id": 1,
          "name": "P1",
          "updated_at": "2015-08-12T04:23:38.183Z"
        },
        {
          "id": 2,
          "name": "P2",
          "updated_at": "2015-10-12T04:23:38.183Z"
        }
      ]
    }
  ]
}

Ideally, I'd also like to be able to specify which attributes, associations, and attributes of those associations are included in each serializer.

我一直在研究AMS的问题，对于如何处理这个问题(或者如果这种功能实际上得到了支持)，似乎存在一些反复，但我很难弄清楚当前的状态到底是什么.

One of the proposed solutions was to override the attribute with a method to call the nested attributes, but that seems to be regarded as a hack so I wanted to avoid it if possible.

Anyway, an example of what of how to go about this or general API advice would be much appreciated.

class ProjectSerializer < ActiveModel::Serializer attributes :id, :name, :updated_at, # has_many :estimates def estimates customized_estimates = [] object.estimates.each do |estimate| # Assign object attributes (returns a hash) # =========================================================== custom_estimate = estimate.attributes # Custom nested and side-loaded attributes # =========================================================== # belongs_to custom_estimate[:project] = estimate.project.slice(:id, :name) # get only :id and :name for the project custom_estimate[:project_code] = estimate.project_code custom_estimate[:tax_type] = estimate.tax_type # has_many w/only specified attributes custom_estimate[:proposals] = estimate.proposals.collect{|proposal| proposal.slice(:id, :name, :updated_at)} # =========================================================== customized_estimates.push(custom_estimate) end return customized_estimates end end

[ { "id": 1, "name": "123 Park Ave.", "updated_at": "2015-08-09T02:36:23.950Z", "estimates": [ { "id": 1, "name": "E1", "release_version": "v1.0", "exchange_rate": "0.0", "created_at": "2015-08-12T04:23:38.183Z", "updated_at": "2015-08-12T04:23:38.183Z", "project": { "id": 1, "name": "123 Park Ave." }, "project_code": { "id": 8, "valuation": 30, "created_at": "2015-08-09T18:02:42.079Z", "updated_at": "2015-08-09T18:02:42.079Z" }, "tax_type": { "id": 1, "name": "No Tax", "created_at": "2015-08-09T18:02:42.079Z", "updated_at": "2015-08-09T18:02:42.079Z" }, "proposals": [ { "id": 1, "name": "P1", "updated_at": "2015-08-12T04:23:38.183Z" }, { "id": 2, "name": "P2", "updated_at": "2015-10-12T04:23:38.183Z" } ] } ] } ]

Json Rails：使用 active_model_serializers 序列化深度嵌套的关联

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