使用Swift保存Firebase中的键值字典 [英] Saving a Dictionary of key-values in Firebase using Swift

问题描述

这个问题是从一个后续：将数组发送到Swift中的firebase数据库

我试图将一些成分保存到食谱，以后可以用里面的配料检索整个配方。看了上面的问题和这篇博客文章 https： //firebase.googleblog.com/2014/04/best-practices-arrays-in-firebase.html 。我能够重新构建我的数据库

这是我的成分词典：

 IngredientDict：{
-KkbWdomTYdpgEDLjC9w：鸡蛋，
-KkbWvaa5DT1PY7q7jIs：意大利面条，
-KkbaDQ8wYJxR3O2OwKd： Parmesan
 
 //更多可能的原料
 
} 
} 
  

这是我的成分数据：

  {
IngredientData：{
成分：{
-KkbWdomTYdpgEDLjC9w：{
name：Eggs，
uid：-KkbWdomTYdpgEDLjC9w
}，
-KkbWvaa5DT1PY7q7jIs：{
name：Spaghetti，
uid：-KkbWvaa5DT1PY7q7jIs
}，
-KkbaDQ8wYJxR3O2OwKd：{
name：Parmesan，
uid：-KkY90e7dAgefc8zH3_F
 
 //更多可能的原料
 
} 
} 
 
 
 
 
 $ b现在我想添加t这一套成分在我的食谱中的一个行动。这是我目前如何做一个配方：
 
 pre $ func addRecipe（_ sender：Any）{
 
 guard let itemNameText = recipeName.text else {return} 
 
 guard itemNameText.characters.count> 0 else {
 
 print（Complete all fields）
 return 
} 
 
 let recipeKey = databaseRef.child（RecipeData）。child （recipe）。childByAutoId（）。key 
 let recipeItem：[String：Any] = [recipeName：itemNameText，recipeID：recipeKey] 
 let recipe = [\（recipeKey ）：recipeItem] 
 
 databaseRef.child（RecipeData）。child（recipe）。updateChildValues（recipe）
 
 print（\（itemNameText）was添加）
} 
  

这是结果：


$ b $ RecipeData {
recipe：{
-Kkv36b_aPl7HAO_VYaJ：{
recipeName：Spaghetti Carbonara，
recipeID：-Kkv36b_aPl7HAO_VYaJ
}
}
}
}

如何添加配料？目前我可以手动将其添加到Firebase。但我希望能有一个行动，保存整个配方的成分。大多数例子给出了一组具有声明属性的字典。然而，我可以是随机的，因为每个配方可以有随机数量的成分。

在您的 addRecipe中 / code>函数，试试这个：

  ... 
 let ingredients：[String] =。 .. 
 var ingredientsJSON = [String：Bool]（）
为配料中的关键字{
 ingredientsJSON [key] = true 
} 
 let recipeJSON：[String：任何] = [
recipeName：itemNameText，
recipeID：recipeKey，
ingredients：ingredientsJSON 
] 
 let recipe = [\（配方密钥）：recipeJSON] 
 databaseRef.child（RecipeData）。child（recipe）。updateChildValues（recipe）
 ... 
  pre> 
This question is a follow up from: Post Array to firebase Database in Swift

I am trying to save some ingredients into a recipe and later be able to retrieve the entire recipe with the ingredients inside it. After looking at the question above and this blog post https://firebase.googleblog.com/2014/04/best-practices-arrays-in-firebase.html. I was able to re-structure my database

This is my Ingredient Dictionary:
{
  "IngredientDict": {
    "-KkbWdomTYdpgEDLjC9w": "Eggs",
    "-KkbWvaa5DT1PY7q7jIs": "Spaghetti",
    "-KkbaDQ8wYJxR3O2OwKd": "Parmesan"

      // More possible ingredients

  }
} 
This is my Ingredient Data:
{
  "IngredientData": {
    "ingredients": {
      "-KkbWdomTYdpgEDLjC9w": {
        "name": "Eggs",
        "uid": "-KkbWdomTYdpgEDLjC9w"
      },
      "-KkbWvaa5DT1PY7q7jIs": {
        "name": "Spaghetti",
        "uid": "-KkbWvaa5DT1PY7q7jIs"
      },
      "-KkbaDQ8wYJxR3O2OwKd": {
        "name": "Parmesan",
        "uid": "-KkY90e7dAgefc8zH3_F"

      // More possible ingredients

      }
    }
  }
}
I now want to add these set of ingredients to my recipe in one action. This is how I currently make a recipe:
@IBAction func addRecipe(_ sender: Any) {

        guard let itemNameText = recipeName.text else { return }

        guard itemNameText.characters.count > 0 else {

            print("Complete all fields")
            return
        }

        let recipeKey = databaseRef.child("RecipeData").child("recipe").childByAutoId().key
        let recipeItem: [String : Any] = ["recipeName" : itemNameText, "recipeID" : recipeKey]
        let recipe = ["\(recipeKey)" : recipeItem]

        databaseRef.child("RecipeData").child("recipe").updateChildValues(recipe)

        print("\(itemNameText) was added")
    }
This is the outcome:
{
  "RecipeData": {
    "recipe": {
      "-Kkv36b_aPl7HAO_VYaJ": {
        "recipeName": "Spaghetti Carbonara",
        "recipeID": "-Kkv36b_aPl7HAO_VYaJ"
      }
    }
  }
}
How do I add the ingredients? At the moment I can manually add it on the Firebase. But I would like to be able have an action that saves the entire recipe with the ingredients. Most examples give a dictionary with a set of declared properties. However mine can be random as each recipe can have random number of ingredients.
解决方案
In your addRecipe function, try this:
...
let ingredients: [String] = ...
var ingredientsJSON = [String: Bool]()
for key in ingredients {
    ingredientsJSON[key] = true
}
let recipeJSON: [String : Any] = [
    "recipeName" : itemNameText,
    "recipeID" : recipeKey,
    "ingredients": ingredientsJSON
]
let recipe = ["\(recipeKey)" : recipeJSON]
databaseRef.child("RecipeData").child("recipe").updateChildValues(recipe)
...


                        
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