app.js
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/**
* @example Lazy Associations
*
* This example demonstrates lazy loading of a {@link Ext.data.Model}'s associations only when requested.
* a `User` model is loaded, then a separate request is made for the `User`'s associated `Post`s
* See console for output.
*/
// define the User model
Ext.define('User', {
extend: 'Ext.data.Model',
fields: ['id', 'name', 'age', 'gender'],
proxy: {
type: 'rest',
url : 'data/users',
reader: {
type: 'json',
root: 'users'
}
},
hasMany: 'Post' // shorthand for {model: 'Post', name: 'posts'}
});
//define the Post model
Ext.define('Post', {
extend: 'Ext.data.Model',
fields: ['id', 'user_id', 'title', 'body'],
proxy: {
type: 'rest',
url : 'data/posts',
reader: {
type: 'json',
root: 'posts'
}
},
belongsTo: 'User',
hasMany: {model: 'Comment', name: 'comments'}
});
//define the Comment model
Ext.define('Comment', {
extend: 'Ext.data.Model',
fields: ['id', 'post_id', 'name', 'message'],
belongsTo: 'Post'
});
Ext.require('Ext.data.Store');
Ext.onReady(function() {
// Loads User with ID 1 User's Proxy
User.load(1, {
success: function(user) {
console.log("User: " + user.get('name'));
// Loads posts for user 1 using Post's Proxy
user.posts().load({
callback: function(posts, operation) {
Ext.each(posts, function(post) {
console.log("Comments for post: " + post.get('title'));
post.comments().each(function(comment) {
console.log(comment.get('message'));
});
});
}
});
}
});
});