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Uncaught TypeError: 'set' on proxy: trap returned falsish for property Name


How to convey LWC's complex Reactive property back to markup?How to set a public reactive property in the declared component during component constructionProperty “selectedContact” of [object:vm undefined > (51)] is set to a non-trackable objectHow to set default value for a select in lwc






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}







4















Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.



Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687



HTML Code:



<template>

<template if:true={wiredContact}>

{wiredContact.Name}

<lightning-input value={wiredContact.Name} onchange={updateName}></lightning-input>
</template>

</template>


JS:



import { LightningElement ,wire,track,api } from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";

export default class Myrefreshapextest extends LightningElement {


@track wiredContact;

@wire (myContact)
fetchedContact({error, data}){
if(data){
console.log(JSON.stringify(data));
this.wiredContact = data;
}else if (error){
console.log(error);
}
}

updateName (event){
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
}

}


Apex:



public class ContactController {

@AuraEnabled(cacheable=true)
public static Contact fetchContact(){
return [SELECT Id,Name FROM COntact LIMIT 1];
}
}


On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?



When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.



I tried with @track and @api, but same response. Can anyone shed some light?










share|improve this question























  • Do you get same issue when you use the individual field names viz., FirstName?

    – Jayant Das
    11 hours ago











  • Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

    – Pranay Jaiswal
    11 hours ago













  • I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

    – Jayant Das
    11 hours ago











  • @JayantDas It's a design feature. One that I'm pretty sure isn't documented.

    – sfdcfox
    11 hours ago











  • @sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

    – Jayant Das
    10 hours ago


















4















Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.



Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687



HTML Code:



<template>

<template if:true={wiredContact}>

{wiredContact.Name}

<lightning-input value={wiredContact.Name} onchange={updateName}></lightning-input>
</template>

</template>


JS:



import { LightningElement ,wire,track,api } from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";

export default class Myrefreshapextest extends LightningElement {


@track wiredContact;

@wire (myContact)
fetchedContact({error, data}){
if(data){
console.log(JSON.stringify(data));
this.wiredContact = data;
}else if (error){
console.log(error);
}
}

updateName (event){
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
}

}


Apex:



public class ContactController {

@AuraEnabled(cacheable=true)
public static Contact fetchContact(){
return [SELECT Id,Name FROM COntact LIMIT 1];
}
}


On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?



When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.



I tried with @track and @api, but same response. Can anyone shed some light?










share|improve this question























  • Do you get same issue when you use the individual field names viz., FirstName?

    – Jayant Das
    11 hours ago











  • Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

    – Pranay Jaiswal
    11 hours ago













  • I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

    – Jayant Das
    11 hours ago











  • @JayantDas It's a design feature. One that I'm pretty sure isn't documented.

    – sfdcfox
    11 hours ago











  • @sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

    – Jayant Das
    10 hours ago














4












4








4








Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.



Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687



HTML Code:



<template>

<template if:true={wiredContact}>

{wiredContact.Name}

<lightning-input value={wiredContact.Name} onchange={updateName}></lightning-input>
</template>

</template>


JS:



import { LightningElement ,wire,track,api } from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";

export default class Myrefreshapextest extends LightningElement {


@track wiredContact;

@wire (myContact)
fetchedContact({error, data}){
if(data){
console.log(JSON.stringify(data));
this.wiredContact = data;
}else if (error){
console.log(error);
}
}

updateName (event){
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
}

}


Apex:



public class ContactController {

@AuraEnabled(cacheable=true)
public static Contact fetchContact(){
return [SELECT Id,Name FROM COntact LIMIT 1];
}
}


On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?



When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.



I tried with @track and @api, but same response. Can anyone shed some light?










share|improve this question














Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.



Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687



HTML Code:



<template>

<template if:true={wiredContact}>

{wiredContact.Name}

<lightning-input value={wiredContact.Name} onchange={updateName}></lightning-input>
</template>

</template>


JS:



import { LightningElement ,wire,track,api } from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";

export default class Myrefreshapextest extends LightningElement {


@track wiredContact;

@wire (myContact)
fetchedContact({error, data}){
if(data){
console.log(JSON.stringify(data));
this.wiredContact = data;
}else if (error){
console.log(error);
}
}

updateName (event){
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
}

}


Apex:



public class ContactController {

@AuraEnabled(cacheable=true)
public static Contact fetchContact(){
return [SELECT Id,Name FROM COntact LIMIT 1];
}
}


On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?



When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.



I tried with @track and @api, but same response. Can anyone shed some light?







lightning-web-components






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 11 hours ago









Pranay JaiswalPranay Jaiswal

18.6k53158




18.6k53158













  • Do you get same issue when you use the individual field names viz., FirstName?

    – Jayant Das
    11 hours ago











  • Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

    – Pranay Jaiswal
    11 hours ago













  • I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

    – Jayant Das
    11 hours ago











  • @JayantDas It's a design feature. One that I'm pretty sure isn't documented.

    – sfdcfox
    11 hours ago











  • @sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

    – Jayant Das
    10 hours ago



















  • Do you get same issue when you use the individual field names viz., FirstName?

    – Jayant Das
    11 hours ago











  • Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

    – Pranay Jaiswal
    11 hours ago













  • I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

    – Jayant Das
    11 hours ago











  • @JayantDas It's a design feature. One that I'm pretty sure isn't documented.

    – sfdcfox
    11 hours ago











  • @sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

    – Jayant Das
    10 hours ago

















Do you get same issue when you use the individual field names viz., FirstName?

– Jayant Das
11 hours ago





Do you get same issue when you use the individual field names viz., FirstName?

– Jayant Das
11 hours ago













Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

– Pranay Jaiswal
11 hours ago







Same error Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.

– Pranay Jaiswal
11 hours ago















I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

– Jayant Das
11 hours ago





I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g., this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.

– Jayant Das
11 hours ago













@JayantDas It's a design feature. One that I'm pretty sure isn't documented.

– sfdcfox
11 hours ago





@JayantDas It's a design feature. One that I'm pretty sure isn't documented.

– sfdcfox
11 hours ago













@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

– Jayant Das
10 hours ago





@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.

– Jayant Das
10 hours ago










2 Answers
2






active

oldest

votes


















3














Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.



this.wiredContact = Object.assign({}, data);





share|improve this answer
























  • +1 for Object.assign(). Didn't know something like this existed.

    – Jayant Das
    9 hours ago













  • Thanks sfdcfox. You are truly a Javascript wizard.

    – Pranay Jaiswal
    9 hours ago











  • @JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

    – tsalb
    4 hours ago













  • @tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

    – Jayant Das
    4 hours ago



















1














This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).




The wire service provisions an immutable stream of data to the component




So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.



However if you try to create a new data and then assign it to this.wiredContact, it works:



this.wiredContact = "{Name:" + event.detail.value + "}";





share|improve this answer
























  • This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

    – sfdcfox
    9 hours ago











  • Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

    – Jayant Das
    9 hours ago











  • +1 thanks for linking documentation. This was freaking me out.

    – Pranay Jaiswal
    9 hours ago






  • 1





    I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

    – Jayant Das
    9 hours ago












Your Answer








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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.



this.wiredContact = Object.assign({}, data);





share|improve this answer
























  • +1 for Object.assign(). Didn't know something like this existed.

    – Jayant Das
    9 hours ago













  • Thanks sfdcfox. You are truly a Javascript wizard.

    – Pranay Jaiswal
    9 hours ago











  • @JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

    – tsalb
    4 hours ago













  • @tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

    – Jayant Das
    4 hours ago
















3














Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.



this.wiredContact = Object.assign({}, data);





share|improve this answer
























  • +1 for Object.assign(). Didn't know something like this existed.

    – Jayant Das
    9 hours ago













  • Thanks sfdcfox. You are truly a Javascript wizard.

    – Pranay Jaiswal
    9 hours ago











  • @JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

    – tsalb
    4 hours ago













  • @tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

    – Jayant Das
    4 hours ago














3












3








3







Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.



this.wiredContact = Object.assign({}, data);





share|improve this answer













Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.



this.wiredContact = Object.assign({}, data);






share|improve this answer












share|improve this answer



share|improve this answer










answered 11 hours ago









sfdcfoxsfdcfox

263k12209456




263k12209456













  • +1 for Object.assign(). Didn't know something like this existed.

    – Jayant Das
    9 hours ago













  • Thanks sfdcfox. You are truly a Javascript wizard.

    – Pranay Jaiswal
    9 hours ago











  • @JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

    – tsalb
    4 hours ago













  • @tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

    – Jayant Das
    4 hours ago



















  • +1 for Object.assign(). Didn't know something like this existed.

    – Jayant Das
    9 hours ago













  • Thanks sfdcfox. You are truly a Javascript wizard.

    – Pranay Jaiswal
    9 hours ago











  • @JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

    – tsalb
    4 hours ago













  • @tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

    – Jayant Das
    4 hours ago

















+1 for Object.assign(). Didn't know something like this existed.

– Jayant Das
9 hours ago







+1 for Object.assign(). Didn't know something like this existed.

– Jayant Das
9 hours ago















Thanks sfdcfox. You are truly a Javascript wizard.

– Pranay Jaiswal
9 hours ago





Thanks sfdcfox. You are truly a Javascript wizard.

– Pranay Jaiswal
9 hours ago













@JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

– tsalb
4 hours ago







@JayantDas In ES6, the syntactic sugar is: this.wiredContact = {...data};

– tsalb
4 hours ago















@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

– Jayant Das
4 hours ago





@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question

– Jayant Das
4 hours ago













1














This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).




The wire service provisions an immutable stream of data to the component




So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.



However if you try to create a new data and then assign it to this.wiredContact, it works:



this.wiredContact = "{Name:" + event.detail.value + "}";





share|improve this answer
























  • This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

    – sfdcfox
    9 hours ago











  • Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

    – Jayant Das
    9 hours ago











  • +1 thanks for linking documentation. This was freaking me out.

    – Pranay Jaiswal
    9 hours ago






  • 1





    I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

    – Jayant Das
    9 hours ago
















1














This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).




The wire service provisions an immutable stream of data to the component




So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.



However if you try to create a new data and then assign it to this.wiredContact, it works:



this.wiredContact = "{Name:" + event.detail.value + "}";





share|improve this answer
























  • This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

    – sfdcfox
    9 hours ago











  • Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

    – Jayant Das
    9 hours ago











  • +1 thanks for linking documentation. This was freaking me out.

    – Pranay Jaiswal
    9 hours ago






  • 1





    I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

    – Jayant Das
    9 hours ago














1












1








1







This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).




The wire service provisions an immutable stream of data to the component




So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.



However if you try to create a new data and then assign it to this.wiredContact, it works:



this.wiredContact = "{Name:" + event.detail.value + "}";





share|improve this answer













This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).




The wire service provisions an immutable stream of data to the component




So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.



However if you try to create a new data and then assign it to this.wiredContact, it works:



this.wiredContact = "{Name:" + event.detail.value + "}";






share|improve this answer












share|improve this answer



share|improve this answer










answered 10 hours ago









Jayant DasJayant Das

18k21330




18k21330













  • This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

    – sfdcfox
    9 hours ago











  • Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

    – Jayant Das
    9 hours ago











  • +1 thanks for linking documentation. This was freaking me out.

    – Pranay Jaiswal
    9 hours ago






  • 1





    I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

    – Jayant Das
    9 hours ago



















  • This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

    – sfdcfox
    9 hours ago











  • Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

    – Jayant Das
    9 hours ago











  • +1 thanks for linking documentation. This was freaking me out.

    – Pranay Jaiswal
    9 hours ago






  • 1





    I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

    – Jayant Das
    9 hours ago

















This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

– sfdcfox
9 hours ago





This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.

– sfdcfox
9 hours ago













Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

– Jayant Das
9 hours ago





Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.

– Jayant Das
9 hours ago













+1 thanks for linking documentation. This was freaking me out.

– Pranay Jaiswal
9 hours ago





+1 thanks for linking documentation. This was freaking me out.

– Pranay Jaiswal
9 hours ago




1




1





I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

– Jayant Das
9 hours ago





I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!

– Jayant Das
9 hours ago


















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