---
title: Creating and deleting object hierarchies
slug: api/creating-and-deleting-object-hierarchies
createdAt: 2024-06-20T15:21:47.359Z
---

Let's assume you want to create grandfather, father and grandchild in a "Person" entity. To fill the "Father" property for the grandchild, you need the DataId of the father record. You can now first save the father using a Save, use the returned GUID to create the father with the next Save call, and so on.

In **one step**, you do this using a **SaveAll**: If no entry with the DataId passed in as a parameter exists yet, a new record is created! This also works to create a dependent record in this one query!

**Example**:

Entity "Person" with the EntityId ff5f6566-d02c-4040-9016-cd222aaff0ee has a property Custom\_001 name and a property Custom\_002 father. For the sake of clarity, we store the relationship as text in the names.

We use random, newly generated values ​​as DataIds. This works in various programming languages, for example, like this:

C#: Guid.NewGuid();
Java: UUID newGuid = java.util.UUID.randomUUID();
PHP: $newGuid = uniqid();
TypeScript: const newGuid = uuidv4();

```javascript
{
	"items": [
		{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "af92a7a0-e6a2-4237-a33c-5a87dd444fad"
        	"Custom_001": "Großvater"
		}
        ,{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "4e609b9b-37c4-43aa-86ce-67e8377e8afa"
        	"Custom_001": "Vater",
        	"Custom_002": "af92a7a0-e6a2-4237-a33c-5a87dd444fad",			
		}
		,{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "af92a7a0-e6a2-4237-a33c-5a87dd444fad"
			"Custom_001": "Enkel",
        	"Custom_002": "4e609b9b-37c4-43aa-86ce-67e8377e8afa"
		}
	]
}
```

This entire hierarchy can also be deleted using a SaveAll, in which all entries are set to "**isActive" = 0**. The presence of a "child" may prevent the deletion of a "father". In this case, the order of the records must be reversed: the child is at the top, the grandfather at the bottom:

```javascript
{
	"items": [
		{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "af92a7a0-e6a2-4237-a33c-5a87dd444fad"
			"IsActive": 0,
		},
		{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "4e609b9b-37c4-43aa-86ce-67e8377e8afa"
        	"IsActive": 0,
		},
		{
			"EntityId": "ff5f6566-d02c-4040-9016-cd222aaff0ee",
            "DataId": "af92a7a0-e6a2-4237-a33c-5a87dd444fad"
        	"IsActive": 0,
		}
	]
}
```