Collapse using Transition Vue - laravel-5

Question

I would like to use Vue's collapse in my code, but I have an error.
[Vue warn]: <transition-group> children must be keyed: <p>
My component:
<template xmlns:v-model="http://www.w3.org/1999/xhtml" xmlns:v-on="http://www.w3.org/1999/xhtml">
<section style="background-color: #dedede;">
<div class="container-fluid">
<div class="Consult-faq container">
<div class="row">
<div class="col-sm-12">
<h2>Cursos</h2>
<a v-for="(course,id) in courses" v-on:click="course.show = !course.show">
<a v-on:click="show = !show">
<div class="col-xs-12" style="border-bottom: solid;border-bottom-color: #999999;border-bottom-width:1px ">
<div class="col-xs-12">
<h4>
<i v-if="course.show" class="fa fa-plus-square text-right" aria-hidden="true"/>
<i v-else class="fa fa-minus-square text-right" aria-hidden="true"/>
{{course.text}}
</h4>
</div>
</div>
<transition-group name="fade">
<p v-if="show">
<div class="col-xs-12">
<article v-for="n in 2" class="Module-content">
<div class=" col-sm-12 col-md-6" style="position: relative;">
<div v-for="(course, index) in course.courses">
<course-card v-if="index % 2 == n - 1" :course="course"></course-card>
</div>
</div>
</article>
</div>
</p>
</transition-group>
</a>
</a>
</div>
</div>
</div>
</div>
</section>
</template>
<script>
export default{
props : [
'courses'
],
data(){
return {
show: false
}
},
mounted() {
console.log(this.courses)
}
}
</script>
So, I'd like to know to collapse item per item. Like this in image.
When I click to expand, all courses expand or close all courses close.

Answer 1

Transition is irrelevant here (though you can get rid of that warning by using transition instead of transition-group, because the transition is only acting on a single node, not a group.)
Right now you're depending on a single variable show to control all of the elements' visibility, so they will all respond to clicks on any of them:
<a v-on:click="show = !show">
<p v-if="show" >
You need individual variables for each element if you want them to expand/collapse separately. You partially did this already, just change the remaining instances of show with course.show and you should be good to go.
(Probably want to clean up that nested <a> within <a> while you're at it; you can just remove the inner one.)

Answer 2

I solved this using vue-resource, I was using Guzzle in Laravel and require data in Controller make this not reactive. And I solved this problem using vue-resource in component.