# NR Conundrum sett flow context changes global context

**URL:** https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955
**Category:** General
**Created:** [12 October 2022 23:00 UTC](https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955 "2022-10-12T23:00:51Z")
**Posts on this page:** 4
**Page:** 1

<div class="post-metadata">

### Author: ![Sandmman](https://avatars.discourse-cdn.com/v4/letter/s/eada6e/32.png) [@Sandmman](https://discourse.nodered.org/u/Sandmman)
#### Post date: [12 October 2022 23:00 UTC](https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955/1 "2022-10-12T23:00:51Z")

</div>

I'm trying to understand how it could be that after reading global context into a flow context, checking for the existence of a value ("on") in the flow context in order to determine what groups I need to serve, that action in itself changes the global context. I've asked a friend and we are getting no where.

Try the code I hope it is exemplary as a debugging routine.....I can't see where it would go as it does.....

This will allow you to build the global, array and fish for data...

```auto
[{"id":"73542c331aa93af6","type":"function","z":"973ac71228b5a79f","name":"Adaptive Lighting Execution(selection)","func":"/**get actual brigness and color levels */\nvar brightness = global.get('light[0].brightness'); /** not stored in HA only NR */\nvar color_temp = global.get('light[0].color_temp'); /**not stored in HA only NR */\nflow.set('brightness', brightness); /**debug */\nflow.set('color_temp', color_temp); / **debug */\n\n\n/** automations woonkmr (room[1])] */\n/**automations badkamer (room[2])] */\n/** automations slaapkamer (room[3])] */\n/**automations werkkamer (room[4])] */\n/** automations logeerkamer (room[5])] */\nvar room_data = global.get(\"house[0].room[5]\");\nflow.set(\"room_data\", room_data);\nif (room_data === null) {\n node.warn(\"room data leeg\");\n} else {\n\n var max_bright = parseInt(room_data.max_bright);/ **max applicable bright level*/\n var lightgroup = room_data.lightgroup; /** get lighting groups of room6 */\n var nummer = Number(lightgroup.length); /**equals number of lighting groups */\n\n for (let index = 0; index < nummer; index++) { /** run through array */\n\n if (lightgroup[index].adaptive = \"on\") { /**if LG is set to adaptive, save ent_id */\n flow.set(\"set_group[\" + index + \"]\", lightgroup[index].entity_id); /** array with all groups to serve */\n }\n }\n\n var entity_to_set = flow.get(\"set_group\");\n if (brightness > max_bright) {\n var set_brightness = max_bright\n } else set_brightness = brightness;\n\n\n let sep = \"\";\n for (let x of entity_to_set) {\n sep += x;\n var msg1 = { topic: entity_to_set, payload: set_brightness };\n flow.set(\"msg5_1\", msg1);\n var msg2 = { topic: entity_to_set, payload: color_temp };\n flow.set(\"msg5_2\", msg2);\n }\n node.send([[msg1, msg2]]);\n msg1 = null;\n msg2 = null;\n} \n/**automations greenroom (room[6])] */\nvar room_data = global.get(\"house[0].room[6]\");\nflow.set(\"room_data\", room_data);\nif (room_data === null){\n node.warn(\"room data leeg\");\n}else {\n \n var max_bright = parseInt(room_data.max_bright);/**max applicable bright level*/\n var lightgroup = room_data.lightgroup; /**get lighting groups of room6 */\n var nummer = Number(lightgroup.length); /** equals number of lighting groups */\n \n for (let index = 0; index < nummer; index++) { /**run through array */\n\n if (lightgroup[index].adaptive == \"on\") { /** if LG is set to adaptive, save ent_id */\n flow.set(\"set_group[\" + index + \"]\", lightgroup[index].entity_id); /** array with all groups to serve */\n }\n }\n \n var entity_to_set = flow.get(\"set_group\");\n if (brightness > max_bright) {\n var set_brightness = max_bright\n } else set_brightness = brightness;\n \n\n let sep = \"\";\n for (let x of entity_to_set) {\n sep += x;\n var msg1 = { topic: entity_to_set, payload : set_brightness};\n flow.set(\"msg6_1\", msg1);\n var msg2 = { topic: entity_to_set, payload: color_temp};\n flow.set(\"msg6_2\", msg2);\n }\n node.send([[msg1, msg2]]);\n msg1 = null;\n msg2 = null;\n} \nvar newMsg = { payload: null};\nreturn newMsg;\n\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":990,"y":320,"wires":[["a14529924219d322"]]},{"id":"9ab1fe67824a661e","type":"debug","z":"973ac71228b5a79f","name":"debug 1","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1340,"y":200,"wires":[]},{"id":"476239f30574de72","type":"inject","z":"973ac71228b5a79f","name":"This is magic","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":670,"y":320,"wires":[["73542c331aa93af6"]]},{"id":"43f81f7af4c4ab4c","type":"inject","z":"973ac71228b5a79f","name":"0. 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```

Good night y'all 🙂

---

<div class="post-metadata">

### Author: ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [12 October 2022 23:24 UTC](https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955/2 "2022-10-12T23:24:46Z")

</div>

Javascript store object by reference.  
So setting flow to a variable sets the variable to reference the same memory. If you then alter either the other will reference the new value.

you will need to clone it using RED.util.cloneMessage(flow.get("string"))

> **[Cloning messages in a flow](https://nodered.org/blog/2019/09/13/cloning-messages)**
>
> With the move to asynchronous messaging, we're also changing how the Function node clones messages. Find out what cloning is all about, why it's necessary and what's changing in 1.0.

> **[Object references and copying](https://javascript.info/object-copy)**

---

<div class="post-metadata">

### Author: ![Sandmman](https://avatars.discourse-cdn.com/v4/letter/s/eada6e/32.png) [@Sandmman](https://discourse.nodered.org/u/Sandmman)
#### Post date: [13 October 2022 10:34 UTC](https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955/3 "2022-10-13T10:34:13Z")

</div>

Well, i tried doing that `object.assign` and that does work, not sure if this is the way but hey

```auto
var room_data = global.get("house[0].room[5]");
Object.assign(room_data, global.get("house[0].room[5]") ); 

```

I AM still wondering why a simple

```auto
for (let index = 0; index < nummer; index++) { /** run through array */
        if (lightgroup[index].adaptive == "on") { /** if LG is set to adaptive, save ent_id */
            flow.set("set_group[" + index + "]", lightgroup[index].entity_id); /** array with all groups to serve */
        }
    }

```

and the ` if (lightgroup[index].adaptive == "on")`part of it specifically actual changes the values....

```auto
single equal a = b, set value of b to a.
double equal a==b (false), a==a (true), 10 == twelve (false), 12 == twelve (true), checks (with string conversion)
triple equal a === a(false) is a NOT statement.

```

Which one checks AND changes the values to check? Where does that happen?

this is the array before the above code runs (value for adapt are on, off,

```auto
const lightgroup = [{"entity_id":"light.group_greenrm","adaptive":"on"},{"entity_id":"light.group_tvbas","adaptive":"off"}]

```

but aftwards the off changed to on

```auto
const lightgroup = [{"entity_id":"light.group_greenrm","adaptive":"on"},{"entity_id":"light.group_tvbas","adaptive":"on"}]

```

So where does checking if equal, make equal?

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [12 December 2022 10:34 UTC](https://discourse.nodered.org/t/nr-conundrum-sett-flow-context-changes-global-context/68955/4 "2022-12-12T10:34:33Z")

</div>

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