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

[verachkaverachk]

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?:) 

[glilienfield]

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

[verachkaverachk]

Hello,

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

Vera.

[glilienfield]

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? 

[verachkaverachk]

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 } }

[glilienfield · Accepted solution]

try this:

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