A small question about deleting specific group without deleteing all the other nodes of the graph

Neo4j Graph Platform
1

Hello, can you please help me understand the correct query of deleting specific group of nodes inside a graph,

I want to be able to delete only this: CellType(blue) and the function(red) that is connected to it, and the variables(light green) without deleting the whole graph, for example I want to delete at first the group that i've marked in 1 and only her, and after for example i want to delete the group i've marked in 2 ,but without deleting the whole graph they connect to. is there an elegant and generic way to do it?:)

verachkaverachk_1-1658499899863.png

2

From the look of the graph data, you can match on the function node (red) and delete it and its immediate neighboring nodes.

match (n:Function{id: 0})
match (n)--(m)
detach delete n, m
3

verachkaverachk_0-1658595869026.pngverachkaverachk_1-1658595892789.png

The data of the current graph looks like this:

n

1

{
"identity": 149,
"labels": [
"Variable"
],
"properties": {
"variableName": "x"
}
}

2

{
"identity": 150,
"labels": [
"Function"
],
"properties": {
"expression": "x"
}
}

3

{
"identity": 151,
"labels": [
"CellType"
],
"properties": {
"name": "inputCell",
"transformType": "INPUT_TO_ANALOG"
}
}

4

{
"identity": 152,
"labels": [
"CellInstance"
],
"properties": {
"yCoordinate": 2.7,
"xCoordinate": 2.6
}
}

5

{
"identity": 153,
"labels": [
"CellInstance"
],
"properties": {
"yCoordinate": 2.7,
"xCoordinate": 2.6
}
}

6

{
"identity": 154,
"labels": [
"Variable"
],
"properties": {
"variableName": "x"
}
}

7

{
"identity": 155,
"labels": [
"Variable"
],
"properties": {
"variableName": "y"
}
}

8

{
"identity": 156,
"labels": [
"Function"
],
"properties": {
"expression": "x+y"
}
}

9

{
"identity": 157,
"labels": [
"CellType"
],
"properties": {
"name": "addition",
"transformType": "ANALOG_TO_ANALOG"
}
}

10

{
"identity": 158,
"labels": [
"CellInstance"
],
"properties": {
"yCoordinate": 2.7,
"xCoordinate": 2.6
}
}

11

{
"identity": 159,
"labels": [
"Connection"
],
"properties": {
"delay": 0
}
}

12

{
"identity": 160,
"labels": [
"Connection"
],
"properties": {
"delay": 0
}
}

13

{
"identity": 161,
"labels": [
"Variable"
],
"properties": {
"variableName": "x"
}
}

14

{
"identity": 162,
"labels": [
"Variable"
],
"properties": {
"variableName": "y"
}
}

15

{
"identity": 163,
"labels": [
"Function"
],
"properties": {
"expression": "x+y"
}
}

16

{
"identity": 164,
"labels": [
"CellType"
],
"properties": {
"name": "addition",
"transformType": "ANALOG_TO_ANALOG"
}
}

17

{
"identity": 165,
"labels": [
"CellInstance"
],
"properties": {
"yCoordinate": 2.7,
"xCoordinate": 2.6
}
}

4

Hello,

this query doesn't work for some reason, any other idea? or maybe the syntax not correct?

Vera.

5

I assume you changed the ‘id’ property condition to a property and value that identifies the ‘function’ node you want to delete. If you don’t have a unique identifier, you can use the neo4j id.

what doesn’t work about it? Can you provide some details?

do you have a small script I can use to generate the data for testing?

6

try this:

match (n:Function)
where id(n) in [156, 163]
match (n)--(m)
detach delete n, m