如何使用 Jbuilder & Rails 生成自定义 json 响应

Question

在我的 Ruby Rails 应用程序中，自行车租赁公司可以管理他们所有的自行车（预订、付款等）。

上下文 我想为一家自行车租赁公司 (shops) 提供在他们自己的网站上实施预订表格的选项，这样他们就可以让客户预订 bike.

此预订表格随后会显示 bike_categories，其中 bikes 可用于给定的 arrival 和 departure 日期。

问题为了管理这个，我想生成一个 API 控制器操作，显示 availability 某个 bike_category 显示 count 可用数量 bikes属于这个bike_category。

据此 post

Design RESTful query API with a long list of query parameters

我应该能够在我的 api 中处理查询，但是我如何使用 Jbuilder 在视图中 return count ？

代码

型号

class Shop < ApplicationRecord
  has_many :bike_categories, dependent: :destroy
  has_many :bikes, through: :bike_categories
  has_many :reservations, dependent: :destroy
end

class Reservation < ApplicationRecord
  belongs_to :shop
  belongs_to :bike
end

class Bike < ApplicationRecord
  belongs_to :bike_category
  has_many :reservations, dependent: :destroy
end

class BikeCategory < ApplicationRecord
  belongs_to :shop
  has_many :bikes, dependent: :destroy
end

路线

  namespace :api, defaults: { format: :json } do
    namespace :v1 do
      resources :shops, only: [ :show ]
      resources :reservations, only: [ :show, :create ]
      resources :reservation_contacts, only: [:show, :create]
      resources :reservation_options, only: [:show, :create]
      resources :bike_categories, only: [:index, :show] do
        get :availability, on: :member
      end
    end
  end

controllers/api/v1/bike_categories_controller.rb

class Api::V1::BikeCategoriesController < Api::V1::BaseController
  acts_as_token_authentication_handler_for User, only: [:show, :index, :availability]

  def availability
    @user = current_user
    bike_category = params[:bike_category]
    if @user.shop.bike_categories.include? bike_category
      arrival = params[:arrival]
      departure = params[:departure]
      shop = bike_category.shop
      reservations_overlap = shop.reservations.where("reservations.arrival >= ? AND ? >= reservations.arrival", arrival, departure)
      .or(shop.reservations.where("reservations.arrival <= ? AND ? <= reservations.departure", arrival, arrival)).distinct
      unavailable_bikes = []
      reservations_overlap.each do |res|
        if !unavailable_bikes.include? res.bike && res.bike.bike_category == bike_category
          unavailable_bikes << res.bike
        end
      end
      bikes = bike_category.bikes
      @count = (bikes - unavailable_bikes).length
    else
      error
    end
  end

end

views/api/v1/bike_categories.json.jbuilder

# How to return @count?

Answer 1

your code here...
if @user.shop.bike_categories.include? bike_category
      arrival = params[:arrival]
      departure = params[:departure]
      shop = bike_category.shop
      reservations_overlap = shop.reservations.where("reservations.arrival >= ? AND ? >= reservations.arrival", arrival, departure)
      .or(shop.reservations.where("reservations.arrival <= ? AND ? <= reservations.departure", arrival, arrival)).distinct
      unavailable_bikes = []
      reservations_overlap.each do |res|
        if !unavailable_bikes.include? res.bike && res.bike.bike_category == bike_category
          unavailable_bikes << res.bike
        end
      end
      bikes = bike_category.bikes
      @count = (bikes - unavailable_bikes).length
      render json: @count, status: :ok, adapter: :json
    else
      error = ...some code here...
      render json: error, status: unprocessed_entity, adapter: :json
    end

我会做这样的事情

如何使用 Jbuilder & Rails 生成自定义 json 响应

How to generate a custom json response with Jbuilder & Rails

ruby-on-rails

json

api-design

jbuilder