Question

我有这种类型的json

[{"width":308,"height":248,"fill":"#fff","radius":0,"blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"rectangle","x":84,"y":46},{"width":260,"height":150,"fill":"white","blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"circle","x":497,"y":104},{"width":69,"height":51,"fill":"#fff","radius":0,"blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"rectangle","x":149,"y":112}]

我尝试以json格式写入数据库，但它提供了

{"objects":[[{"width":308,"height":248,"fill":"#fff","radius":0,"blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"rectangle","x":84,"y":46},{"width":260,"height":150,"fill":"white","blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"circle","x":497,"y":104},{"width":69,"height":51,"fill":"#fff","radius":0,"blendMode":"normal","rotate":0,"strokeWidth":1,"stroke":"#b9b9b9","type":"rectangle","x":149,"y":112}]]}

控制器

 def new
    @plan = Plan.new
    @restaurant = Restaurant.find(params[:restaurant_id])
    @plans = @restaurant.plans
    respond_to do |format|
      format.html
      format.json { render json:  @plans.distinct.pluck(:objects) }
    end
  end

  def plan_params
    params.require(:plan).permit(:restaurant_id, objects: [ :width, :height, :fill, :radius, :blendMode, :rotate, :strokeWidth, :stroke, :type, :x, :y])
  end

我需要一种json

{"objects":[{...}]}

更新

class Restaurant < ApplicationRecord
  has_many :plans,  dependent: :destroy
end

class Plan < ApplicationRecord
  belongs_to :restaurant
end

Answer 1

您可以将代码更改为以下内容，以获得您想要的json

@plans.distinct.pluck(:objects).flatten

如何在数据库中编写json数组？

1 个答案: