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Ember Data | has-many Batch Create
import DS from 'ember-data';
import Ember from 'ember';
const { copy } = Ember;
const { Promise } = Ember.RSVP;
export default DS.JSONAPIAdapter.extend({
// just stubbing this for twiddle
ajax(url, params) {
let id = 1;
return Promise.resolve({
data: copy(params.data.data, true).map((r) => {
// emulate an API response containing IDs
r.id = `student-${id++}`;
return r;
})
});
},
batchCreateForHasMany(store, modelName, relationshipName, records, parentRecord) {
let modelClass = store.modelFor(modelName);
let serializer = store.serializerFor(modelName);
let serialized = serializer.serializeRecordArray(store, modelClass, records);
let url = this.urlForPatchHasMany(parentRecord.constructor.modelName, parentRecord.get('id'), modelName, relationshipName);
// roughly, likely wrong
let params = {
method: 'PATCH',
data: serialized
};
// roughly, likely the wrong method signature
return this.ajax(url, params)
.then((jsonApiPayload) => {
store.push(jsonApiPayload);
});
},
// make this into whatever you actually need
urlForPatchHasMany(parentModelName, parentId, modelName, relationshipName) {
return `${parentModelName}/${parentId}/${relationshipName}/`;
}
});
import Ember from 'ember';
let num = 100;
let clientId = 1;
function letterFromNum(num) {
if (num > 90) return 'A';
if (num > 80) return 'B';
if (num > 70) return 'C';
if (num > 60) return 'D';
return 'F';
}
function makeGrade(store, assignment) {
return store.createRecord('grade', {
id: `student-${clientId++}`,
letterValue: letterFromNum(num),
numberValue: num -= 3,
assignment
});
}
export default Ember.Controller.extend({
appName: 'Ember Twiddle',
actions: {
createGrades() {
let assignment = this.get('model.assignment');
let grades = assignment.get('grades');
let store = this.get('store');
for (let i = 0; i < 25; i++) {
grades.pushObject(makeGrade(store, assignment));
}
num = 100;
},
saveGrades() {
let assignment = this.get('model.assignment');
let grades = assignment.get('grades');
let store = this.get('store');
let adapter = store.adapterFor('assignment');
// what would be a more generic case
// adapter.batchCreate(store, grades.toArray());
// better for the hasMany case
adapter.batchCreateForHasMany(store, 'grade', 'grades', grades.toArray(), assignment);
}
}
});
import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { hasMany } from 'ember-data/relationships';
export default Model.extend({
title: attr(),
grades: hasMany('grade', { inverse: 'assignment', async: false })
});
import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo } from 'ember-data/relationships';
export default Model.extend({
letterValue: attr(),
numberValue: attr(),
assignment: belongsTo('assignment', { inverse: 'grades', async: false })
});
import Ember from 'ember';
export default Ember.Route.extend({
model() {
let assignment = this.get('store').push({
data: {
id: '1',
type: 'assignment',
attributes: {
title: 'Assignment 1'
}
}
});
return { assignment };
}
});
import Ember from 'ember';
import DS from 'ember-data';
export default DS.JSONAPISerializer.extend({
payloadKeyFromModelName(modelName) {
return modelName;
},
serializeRecordArray(store, modelClass, records) {
let data = records.map(record => {
return this.serialize(record._createSnapshot()).data;
});
return { data };
}
});
<h1>{{model.assignment.title}}</h1>
<br>
{{#if model.assignment.grades.length}}
<button {{action 'saveGrades'}}>Save Grades</button>
{{/if}}
<hr>
{{#each model.assignment.grades as |grade|}}
<li>{{grade.id}} | {{grade.letterValue}} - {{grade.numberValue}} <i> {{if grade.isNew 'unsaved' 'saved'}}</i></li>
{{else}}
No Grades added yet. <button {{action 'createGrades'}}>Add some?</button>
{{/each}}
<br>
{{outlet}}
<br>
<br>
{
"version": "0.13.1",
"EmberENV": {
"FEATURES": {}
},
"options": {
"use_pods": false,
"enable-testing": false
},
"dependencies": {
"jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
"ember": "2.16.2",
"ember-template-compiler": "2.16.2",
"ember-testing": "2.16.2"
},
"addons": {
"ember-data": "2.16.3"
}
}
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