无法嵌套 JSON Rails

Question

我在通过 rails.

的关系嵌套具有 has_many 的对象时遇到问题

我的模型是这样的：

class SessionDetail < ActiveRecord::Base
 has_many :session_enrollments, dependent: :destroy
 has_many :customers, through: :session_enrollments
end

class SessionEnrollment < ActiveRecord::Base
 belongs_to :customers   //column name is "customers_id"
 belongs_to :session_details //column name is "sessiondetails_id"
end

class Customer < ActiveRecord::Base
 has_many :session_enrollments
 has_many :session_details, through: :session_enrollments
end

我正在尝试将 json 对象嵌套到 return 会话详细信息数组，其中包含一个客户子数组和一个 session_enrollments[ 子数组（一个对象） =14=]

我的控制器电流是这样的：

def return_trainers_sessions
  @trainer_requests = SessionDetail.where(trainers_id: params[:trainers_id], state:     "PENDING")

  unless (!@trainer_requests.any?)
    respond_to do |format|
    msg = {:status => "SUCCESS", :messages => "Requests Found", :requests => @trainer_requests.as_json(:includes => {:customers => {:include =>:session_enrollments}})}
     format.json  { render :json => msg } # don't do msg.to_json
  end

我也试过制作 class 方法，但我只能嵌套客户。

我最终 return 没有客户或 session_enrollments，所以我的 json 看起来我从未将包含添加到 .as_json[ 的右侧=14=]

Answer 1

注意你的多元化。

class SessionDetail < ActiveRecord::Base
  has_many :session_enrollments, dependent: :destroy
  has_many :customers, through: :session_enrollments
end

# a session enrollment belongs to a single customer, and a single session detail. Similarly
# the foreign key fields should be singular, customer_id, session_detail_id
class SessionEnrollment < ActiveRecord::Base
  belongs_to :customer   
  belongs_to :session_detail
end

class Customer < ActiveRecord::Base
  has_many :session_enrollments
  has_many :session_details, through: :session_enrollments
end

无法嵌套 JSON Rails

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