如何访问具有附加一对多关系的联接表上的数据

Question

Hi I have almost the same issue as this previous asked question How to access data on a through table with Bookshelf but instead of a value measurement i hava key to table with unit ( L, Kg, mg, ml and so one ) that is attached to the RecipeIngredient table. what i want to have is similar but with my unit? like this:

{
  "id": 1,
  "name": "Delicious Recipe",
  "ingredients": [
    {
      "id": 1,
      "name": "Tasty foodstuff",
      "_pivot_id": 1,
      "_pivot_recipe_id": 1,
      "_pivot_ingredient_id": 1,
      "_pivot_amount": 10,
      "Unit": "kg"
    }]
}

My many to many table looks like this:

CREATE TABLE IF NOT EXISTS `Ingredients_Recipe` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `Recipe_id` int(11) NOT NULL,
  `Ingredient_id` int(11) NOT NULL,
  `amount` int(11) NOT NULL,
  `Unit_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
KEY `Ingredient_id` (`Ingredient_id`),
KEY `Unit_id` (`Unit_id`),
KEY `Recipe_Ingredients_ibfk_1` (`Recipe_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

And my Unit table looks like this:

CREATE TABLE IF NOT EXISTS `Units` (
  `id` int(11) NOT NULL,
  `unit` varchar(10) NOT NULL,
UNIQUE KEY `unit` (`unit`),
KEY `id` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

My Recipe table looks like this:

CREATE TABLE IF NOT EXISTS `Recipe` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'identifier',
  `name` varchar(254) NOT NULL COMMENT 'Name of the recipe',
  `description` text NOT NULL COMMENT 'Recipe description',
PRIMARY KEY (`id`),
UNIQUE KEY `name` (`name`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;

and my Ingredient table looks like this:

CREATE TABLE IF NOT EXISTS `Ingredients` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `Name` varchar(254) NOT NULL,
PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ;

My Recipe model looks like this

module.exports = Bookshelf.Model.extend({
  tableName: 'Recipe',

  ingredients: function() {
    var Ingredient = require("./Ingredient");

    return this.belongsToMany(Ingredient);
  }
});

and my get request looks like this:

 Recipe.forge({id: "1"})
    .fetch({withRelated: ["ingredients"]})
    .then( function (recipe) {
      resp.json({error: false, data: recipe.toJSON()});
  })
    .otherwise(function (err) {
    resp.status(500).json({error: true, data: {message: err.message}});
  });

If you run this i will get a json response the looks like this: { "id": 1, "name": "Delicious Recipe", "ingredients": [ { "id": 1, "name": "Tasty foodstuff", "_pivot_id": 1, "_pivot_recipe_id": 1, "_pivot_ingredient_id": 1, }] }

but i want to add

"_pivot_amount": 10,
"Unit": "kg"

in the ingredients object.

how do i do that?

Regards

What i try to do is a cookbook app. I am using node.js as restAPI server and when i sending a GET request, what i want is to get recipe with ingredients and amount of the ingredient and with what unit the amount is in.

Answer 1

我使用了一个名为bookends https://city41.github.io/bookends/的小图书馆，基本上可以快速完成所需的工作