Utilizing the Cerialize Library in Angular 2 to bind the properties of an object item to a class

Question

Utilizing the Cerialize Library in Angular 2 to bind the properties of an object item to a class

Summary of JSON data:

{
"courses_purchased_count": 0,
"featured_lesson": {
    "lesson": {
        "id": 290,
        "name": "Christmas Test #290",
        "course": {
            "id": 43,
            "name": "Christmas Test",
            "description": "",
            "teacher": {
                "id": 4,
                "name": "Sandy's Teacher",
                "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0179787b41722f626e6c">[email protected]</a>",
                "role": "TEACHER",
                "token": "xyz",
                "about": "Blah blah blah ",
                "phone": "2222222222",
                "image_url": "xyz",
                "payment_information": {}
            },
            "image": "xyz",
            "cover_image": "xyz",
            "course_type": "WEEKLY_ONGOING",
    },
    "status": "NEXT_AVAILABLE"
}
}

The goal is to map this data into classes defined in models.ts using the Cerialize Library.

models.ts

// Models and utility methods are defined here 
// for deserialization using Cerialize Library

In the homepage component, the data from the lesson object or course object should be displayed as {{featured_lesson.lesson.name}} or {{featured.lesson.course.name}}. However, an error is encountered:

ERROR TypeError: Cannot read property 'name' of undefined

The code snippets for the homepage components are also provided for reference.

Solution and guidance are sought as the learner encounters difficulties while working with Angular. Any help would be greatly appreciated. Thank you!

json angular typescript

Answer 1

Answer №1

Within your component, the variable featured_lesson is declared as a table:

featured_lesson: Featured[] = []

However, in your HTML code, you are treating it like an object:

<div>
  {{featured_lesson.lesson.name}}
</div>

It's important to note that a table is not the same as an object, which means you cannot access the properties of your object directly within the array.

To solve this issue, you have two options:

1 - Convert your featured_lesson into an object:

featured_lesson: Featured = new Featured();

2 - Display an object in your HTML:

{{featured_lesson[0].lesson.name}}

Answer 2

Within your component, the variable featured_lesson is declared as a table:

featured_lesson: Featured[] = []

However, in your HTML code, you are treating it like an object:

<div>
  {{featured_lesson.lesson.name}}
</div>

It's important to note that a table is not the same as an object, which means you cannot access the properties of your object directly within the array.

To solve this issue, you have two options:

1 - Convert your featured_lesson into an object:

featured_lesson: Featured = new Featured();

2 - Display an object in your HTML:

{{featured_lesson[0].lesson.name}}

Utilizing the Cerialize Library in Angular 2 to bind the properties of an object item to a class

Answer №1

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