Firebase query results are mistaken - ios

Question

This is my database design.
foodie-ab2b4{
Foods{
0{
FoodName: "Baked Beans In Tomato Sauce"
FoodRecipe:
FoodUri:
Image:
}
1{
FoodName: "Another bean | Bubbling Bacon Butter Beans recipes"
FoodRecipe:
FoodUri:
Image:
}
}
}
I'm working on an ios project and this is how my firebase json structured.
let ref = Database.database().reference()
func searchFoodByName(FoodName: String){
let foodsRef = ref.child("Foods")
let input = FoodName
let query = foodsRef.child(key).queryOrdered(byChild: "FoodName").queryEnding(atValue: input)
query.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot)
for child in snapshot.children {
let snap = child as! DataSnapshot
let dict = snap.value as! [String: Any]
let fName = dict["FoodName"] as! String
let fIngredients = dict["Ingredients"] as! [String]
print(fName)
print(fIngredients)
let key = snapshot.key
print(key)
}
})
}
I'm trying to filter my food objects by their names. I have 10 objects in my database. In most cases this search return true objects. But there is one example i can not solve.
When i query the "tomato" word i need to get 1 object. But there is two. Although there is no tomato word in my second object.
The two object is in my json file.
If it is necessary i can upload my whole JSON file to here.

Answer 1

You seem to assume that Firebase can filter based on strings that contain a value, but it can't. See Firebase query - Find item with child that contains string (and the many links from there).
What Firebase can do is search for string values that start with a certain value. You do that by using a combination of queryStarting(atValue:) and queryEnding(atValue:):
let query = foodsRef
.queryOrdered(byChild: "FoodName")
.queryStarting(atValue: input)
.queryEnding(atValue: input+"\\uf8ff")
If you use this query, and input is ``Baked`, it will only match the first food from your JSON.