Vue Testing - '... .push is not a function' - javascript

Im trying to test a method of a component that adds a new entry to an already existing object.
addTag: function () {
this.value[this.field.key].push(this.tag)
this.tag = ''
}
I am just trying to call that method inside my test via
wrapper.setProps({
field: {
key: 'tag'
},
value: {
tag: {}
}
})
...
wrapper.vm.addTag()
but it throws and error
TypeError: this.value[this.field.key].push is not a function
Ive set all needed data and props beforehand (field.key and tag), so that's not the problem. running other methods works completly fine, push seems to be the problem

This is because this.value['tag'] is an object, not an array, so there is no push method.
Defining it as an array instead would change that:
wrapper.setProps({
field: {
key: 'tag'
},
value: {
tag: []
}
})

Related

cannot access properties of json objects inside array

I have an array of objects like
[
{
"id":17368,
"creationDate":1566802693000,
"status":"InProgress",
"type":"NEW",
"agentType":"Master"
},
{
"id":17368,
"creationDate":1566802693000,
"status":"InProgress",
"type":"NEW",
"agentType":"Master"
},
{
"id":17368,
"creationDate":1566802693000,
"status":"InProgress",
"type":"NEW",
"agentType":"Master"
},
{
"id":17368,
"creationDate":1566802693000,
"status":"InProgress",
"type":"NEW",
"agentType":"Master"
}
]
But when trying to access the object property 'id' using console.log(array[0].id) throws a "cannot read property id of undefined error"
However just logging the first object with console.log(array[0]) prints the object successfully.
{id: 17368, creationDate: 1566802693000, …}
Also printing the list of ids using array.map(x => console.log(x.id)) prints the list of ids successfully .
I am in a situation where i need to access the first few specifically . Where am i going wrong ?
try this console.log(array[0] && array[0].id)
or you can use get from lodash-es like this:
import { get } from 'lodash-es'
const id=get(array[0], 'id', '')

MST: How to create the main store correctly?

I want to create rootStore which contains others store. The problem is that the children contain properties like:
id: types.identifier(types.string),
And when I create the rootStore, I get an error from the child:
[mobx-state-tree] Error while converting {} to SomeModelStore: at path "/id" value undefined is not assignable to type: identifier(string) (Value is not a string), expected an instance of identifier(string) or a snapshot like identifier(string) instead.
I tried to use types.late but it did not help.
The solution I found is to wrap all properties into types.maybe
Examples:
error:
https://codesandbox.io/s/yvnznxyvyj?module=%2Fmodels%2FSomeModelStore.js
workaround:
https://codesandbox.io/s/0mv558yq50?module=%2Fmodels%2FSomeModelStore.js
Here https://codesandbox.io/s/yvnznxyvyj?module=%2Fmodels%2FSomeModelStore.js you create an empty object
.model("FirstStore", {
item: types.optional(SomeModelStore, {})
})
but type
SomeModelStore
didn't support empty fields. If you write like this
export const FirstStore = types
.model("FirstStore", {
item: types.optional(SomeModelStore, {
id: 'defaultId',
activate: false,
name: 'defaultName'
})
})
it will work. Or you can use "types.maybe" instead of "types.optional".
export const FirstStore = types
.model("FirstStore", {item: types.maybe(SomeModelStore)})
Also read about types.reference
I think it's a better way to use it in your case.

In a Vue component, how to update this.key data property in a loop?

In a Vue Js component, I need to loop through an object on the mounted hook that's in local storage in Vuex to update the data properties as you can see in code example.
I'm trying to update this.title, this.body, this.id whereby the rightHere variable in the loop is outputting these names as string values as the var you can see.
this.rightHere
...is the problem I know, and is obviously trying to target a data property "rightHere" which doesn't exist. But I don't know how else to overcome this in javascript and make rightHere output the string as needed? So how do I use this in a loop to dynamically change but tell Vue to update this. on each iteration?
data() {
return {
title: '',
body: '',
id: '',
}
},
mounted() {
for (var rightHere in this.$store.getters.getObject) {
if (this.$store.getters.getObject.hasOwnProperty(rightHere )) {
this.rightHere = this.$store.getters.getObject[rightHere ]
}
}
},
You would typically set the key in your template. It's a reserved word.
<div v-for='item in items' :key='$store.getters.getKey(item)'>{{item.title}}</div>

Vuejs2: how to judge props update when using object as a prop?

Suppose I have an array feedsArray, the example value may look like this:
this.feedsArray = [
{
id: 1,
type: 'Comment',
value: 'How are you today ?'
},
{
id: 2,
type: 'Meet',
name: 'Daily sync up'
}
]
Suppose I have registered two components: Comment and Meet, Each component has a prop setting as the following:
props: {
feed: Object
}
and the main component has the following definition:
<component v-for="feed in feedsArray" :feed="feed" :key="feed.id" :is="feed.type"></component>
As you can see, it uses is property to select different component. My question is, how to detect feed object change in the child component ? Like when I set
this.feedsArray[0] = {
id: 1,
type: 'Comment',
value: 'I am not ok'
}
How can the Comment component detect the changes ? I tried to add a watcher definition in the child component like the following:
watch: {
feed: {
handler (val) {
console.log('this feed is changed')
},
deep: true
}
},
But it doesn't work here. Anyone know how to solve this ?
Do not assign directly to an array using index - use splice() instead, otherwise JavaScript can not detect that you have changed the array.
If you want to change only the value of an already existing key of an object - then simply update it e.g. this.feeds[0].value = 'I am not okay any more';
This works for existing keys only - otherwise you have to use this.$set(this.feeds[0], 'value', 'I am not okay any more');

Javascript reset object inside array

I have the below JS code in my Ember app that gets called;
myPanels.accordionPanels = [];
myPanels.accordionPanels.push({
panel: {
name: "my-grid",
type: 'comp',
props: [{
key: 'elementId',
value: "myCustomId"
}]
}
});
So as you can see, I start by setting myPanels.accordionPanels = [] every time and then push the object.
However, I got the following error
Assertion Failed: Attempted to register a view with an id already in
use: myCustomId
So I am assuming that the object inside is not getting reset & it is able to find the earlier created "myCustomId".
Am I resetting the array (or rather the object inside it) correctly ?
Since I am able to push values using:
accordionPanels = [];
accordionPanels.push({
panel: {
name: "my-grid",
type: 'comp',
props: [{
key: 'elementId',
value: "myCustomId"
}]
}
});
make sure myPanels.accordionPanels doesn't have any prototype associated with it.
Try to inspect its value as:
myPanels.accordionPanels = [];
console.log(myPanels.accordionPanels); // see if it has values.
You can delete value using :
delete myPanels.accordionPanels PROTOTYPE

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