Why my simple ExtJS data example with associations does not work? - javascript

from my point of view I build the simplest way of model with associations in ExtJS.
Model:
Post --hasOne--> User
What I did:
Using a memory proxy
Follow the rule: Proxy in Model
Load a post object by Post.load(...).
But when I try to get the user object, it is not right loaded:
(Here the full source: http://jsfiddle.net/7XRw4/4/)
Ext.define('Post', {
extend: 'Ext.data.Model',
fields: ['user_id', 'content'],
hasOne: 'User',
proxy: {
type: 'memory',
data: {
posts: [
{id:1, user_id:1, content:'foo'},
{id:2, user_id:1, content:'bar'}
]
},
reader: {
type: 'json',
root: 'posts'
}
}
});
Ext.define('User', {
extend: 'Ext.data.Model',
fields: ['name'],
proxy: {
type: 'memory',
data: {
users: [
{id:1, name:'hans'},
{id:2, name:'klaus'}
]
},
reader: {
type: 'json',
root: 'users'
}
}
});
Ext.onReady(function() {
console.log("Ext.onReady() invoked...");
Post.load('1', {
success: function(record, operation) {
thePost = record;
console.log('thePost:', thePost);
theUser = thePost.getUser();
console.log('theUser:', theUser);
alert('The user name: ' + theUser.get('name'));
// The user object will not be right loaded! Why?
}
});
});

Isn't .getUser asynchronous? Meaning you should supply it with a success function and alert the user's name in that success function?
But I have had plenty of problems with hasOne relations in Ext. Documentation, tutorials, comments on documentation - they never agree and nothing works if you don't send the complete relation in the json.

Related

How to save, load and delete from database using a single ExtJS model?

Using ExtJS 6 one can have a store bind to the model and use the methods sync to save or load to load data.
I imagine that if a data is removed from store, upon calling sync the data will be removed from database too.
In my use case, I have different URLs and mandatory Ajax query fields for each action of create/update, load and delete data.
I have only seen examples showing load or save to storage, how can I declare the load, save and delete using Ajax in the same model?
Another doubt I have is that stores themselves can have a proxy, so they can perform those operations too, at least the load operation that I have seen in use. What's the difference between having these on the model or store? What's the best practice?
Example model from Sencha docs (is this only for read?):
Ext.define('MyApp.model.Base', {
extend: 'Ext.data.Model',
fields: [{
name: 'id',
type: 'int'
}],
schema: {
namespace: 'MyApp.model', // generate auto entityName
proxy: { // Ext.util.ObjectTemplate
type: 'ajax',
url: '{entityName}.json',
reader: {
type: 'json',
rootProperty: '{entityName:lowercase}'
}
}
}
});
Another example I found on https://examples.sencha.com/extjs/6.0.1/examples/classic/writer/writer.html using the proxy config, this seems more like what I would need as it specifies a URL for each operation:
var store = Ext.create('Ext.data.Store', {
model: 'Writer.Person',
autoLoad: true,
autoSync: true,
proxy: {
type: 'ajax',
api: {
read: 'app.php/users/view',
create: 'app.php/users/create',
update: 'app.php/users/update',
destroy: 'app.php/users/destroy'
},
reader: {
type: 'json',
successProperty: 'success',
root: 'data',
messageProperty: 'message'
},
writer: {
type: 'json',
writeAllFields: false,
root: 'data'
},
listeners: {
exception: function(proxy, response, operation){
Ext.MessageBox.show({
title: 'REMOTE EXCEPTION',
msg: operation.getError(),
icon: Ext.MessageBox.ERROR,
buttons: Ext.Msg.OK
});
}
}
},
listeners: {
write: function(proxy, operation){
if (operation.action == 'destroy') {
main.child('#form').setActiveRecord(null);
}
Ext.example.msg(operation.action, operation.getResultSet().message);
}
}
});
I believe I can have something like this in my case (this is just an example not tested!):
Ext.define('My.Person.Model', {
proxy: {
type: 'ajax',
api: {
read: 'http://myapiserver/getuser',
create: 'http://myapiserver/upsertuser',
update: 'http://myapiserver/upsertuser',
destroy: 'http://myapiserver/removeuser'
},
reader: {
type: 'json',
successProperty: 'success',
root: 'data',
messageProperty: 'message'
},
writer: {
type: 'json',
writeAllFields: false,
root: 'data'
},
// How can I have the parameters for each one?
extraParams : {
isuserUnderage : ' '
, query : '%'
}
}
});
I have no idea how to do this, specially specifying parameters for each type of Ajax request (read, create, update, destroy), I can have an upsert request that will send all fields, but the remove request will require only the ID, the get request can have optional fields for filtering, like filtering persons by name.
Example to be more clear of the problem.
Example data:
[
{
"id": "1",
"name": "Fred",
"age": 21,
"sex": "m"
},
{
"id": "2",
"name": "Susan",
"age": 12,
"sex": "f"
},
{
"id": "3",
"name": "Marcus",
"age": 22,
"sex": "m"
},
{
"id": "4",
"name": "Alex",
"age": 32,
"sex": "m"
}
]
Endpoints example:
Endpoints have parameters, these are mandatory, this means that calling an enpoint without a parameter will cause a server error, also passing a parameter that is not specified will cause a server error! If a parameter is not necessary one can pass a string with a single whitespace .
To read:
Endpoint: http://myapiserver/getuser?query={query}
Name is a filter by name, for example http://myapiserver/getuser?query=fred will bring users with name that has the string fred.
To write, we usually have an upsert, so it works for both insert and update:
Endpoint: http://myapiserver/upsertuser?id={id}&name={name}&age={age}&sex={sex}
So to update we can pass the ID: http://myapiserver/upsertuser?id=1&name=Frederick&age=21&sex=m and to insert we pass an empty string for ID: http://myapiserver/upsertuser?id= &name=Maurice&age=41&sex=m
To remove:
Endpoint: http://myapiserver/removeuser?id={id}
Example: http://myapiserver/removeuser?id=1, removes person with ID 1.
Because you say it's mandatory to use GETs with query params, I would encourage you to rethink your tech stack because the RESTful verbs really make it more clear what your action is, and you remove the actual action from your URL routes. However, I know sometimes this is totally out of our control, so I'll try my best here... I have to say, I've never experienced something like this, so I don't know if what I'm showing here is a best practice.
I can't show a true implementation because Sencha Fiddle is a simple sandbox, not meant for actual server-side implementations. I'm also assuming that you're using the classic toolkit, but if you need it in modern, it's a fairly easy port that you can do.
I prefer the proxy inside of the model for several reasons... if I need to use this model in several different stores throughout my app, then each store will inherit the same proxy. If I want to use the same model, but I don't want its proxy, I can simply override it when defining the store. Also, if the proxy doesn't exist on the model, then the framework assumes what your URL should be, which doesn't work when I want to use models individually.
I think I've come up with what you're asking for in this Fiddle. Really the core of what you want is in GETUser.js.
// We need to create our own proxy that will handle this for us
Ext.define('AjaxGet', {
extend: 'Ext.data.proxy.Ajax',
alias: 'proxy.ajaxGet',
// Per your requirement, we want to send individual requests
batchActions: false,
createOperation: function (action, config) {
// This means we're doing an action against one of our records
if (config && config.records) {
if (action === 'destroy') {
config.params = config.records[0].getDeleteParams();
} else if (action === 'create' || action === 'update') {
config.params = config.records[0].getUpsertParams();
}
}
return this.callParent(arguments);
}
});
// This is the desired, "GET" User model that uses GETs and query params for all actions
Ext.define('GETUser', {
extend: 'Ext.data.Model',
idProperty: 'Id',
fields: [{
name: 'Name',
type: 'string'
}, {
name: 'Id',
type: 'int'
}, {
name: 'Age',
type: 'int'
}, {
name: 'Sex',
type: 'string'
}],
proxy: {
type: 'ajaxGet',
api: {
read: 'Users',
create: 'upsertuser',
update: 'upsertuser',
destroy: 'removeuser'
},
actionMethods: {
create: 'GET',
update: 'GET',
destroy: 'GET'
}
},
getUpsertParams: function () {
const data = this.getData();
// Means this record hasn't been saved, so we're in the CREATE state
if (this.phantom) {
// We don't want to send the ID with what the framework sets as the ID
data.Id = undefined;
}
return data;
},
getDeleteParams: function () {
return {
Id: this.get('Id')
};
}
});
So what I ended up doing was creating a custom proxy that overrides the createOperation method to check which operation we're doing... based on that operation, we use the methods in the model to retrieve the params we want to send to the API. You need actionMethods in the proxy because otherwise, they default to POSTs.

ExtJs deleting element from store doesn't work

I'm working with ExtJs 6.2.0 and Java Spring MVC for the REST API.
I'm trying to delete an object from one of my store but I'm having a problem : instead of using my id named idCamp, extjs is using the field named id that contains an extjs generated id (for example: extModel47-1).
I'm working on the delete part but I didn't try to update a camp nor fetch one, but I think the configuration is the same for these three operations that need the id.
Here is my store:
Ext.define('XXXXXX.store.Camps', {
extend: 'Ext.data.Store',
alias: 'store.camps',
model: 'XXXXXX.model.Camp',
fields: [
'idCamp', // More irrelevant fields
],
autoLoad : true,
autoSync: true,
storeId: 'storeCamp',
proxy: {
type: 'rest',
idParam: 'idCamp',
url: // irrelevant,
reader: {
type: 'json',
rootProperty: 'data'
},
writer: {
type: 'json'
}
}
});
Here is my model:
Ext.define('XXXXXX.model.Camp', {
extend: 'Ext.data.Model',
idProperty: 'idCamp',
fields: [
{ name: 'idCamp', type: 'int' },
// More irrelevant fields
]
});
I also tried to put an idProperty inside the writer/reader inside the proxy but it didn't do anything.
Forgive my poor usage of the English language since I'm a French people.
Best regards,
Morony
The issue is using a combination of fields/model in your store definition. They are in competition with each other. Remove the fields definition.

Ext JS dynamic store insert Cannot read property 'isModel' of undefined

I dynamically create my store from a model relation and attach this store to a grid.
var map = record.getCommunity().mappings();
map.load({
url: '/myUrl/mappings',
scope: this,
callback: function(records, operation, success) {
map.group('type');
//ExtJS bug https://www.sencha.com/forum/showthread.php?265674
me.getOutgoingGrid().destroy();
childGrid = Ext.create('hds.view.outgoingGrid', {
store: map
});
me.getGridHolder().add(childGrid);
me.getOutgoingGrid().getSelectionModel().select(0, false) ;
}
});
When I want to create a new model instance and insert it into this dynamic store I get the following error:
Cannot read property 'isModel' of undefined
Here is the code that triggers the error:
var newMap = Ext.create('hds.model.MappingModel', {
indetifier : "something",
});
me.getOutgoingGrid().store.insert(0, newMap);
I cannot found the reason of this problem....Any ideas?
It is hard to know what is breaking your code but here are a couple of things:
1 - You need to define the model identifier in the class prototype not in the instance.
2 - You misspelled identifier
So your model should look like:
Ext.define('hds.model.MappingModel', {
identifier : "something",
});
var newMap = new hds.model.MappingModel({
//...your config here
});
The error that you are seeing Cannot read property 'isModel' of undefined is thrown when the store tries to check if model is an instance of Ext.data.Model but the model being passed is undefined.
This can happen for several reasons but usually it's because you are trying to create a model before the prototype has been defined or because there is a typo on your code.
Please, try creating a a fiddle (https://fiddle.sencha.com) reproducing this error or it will be very hard to help you.
Regards,
If there was an fiddle, It would be more helpful. As I understand from your question, you have some data and you can't set the data to store or model correctly. If you had defined your model or store before set to grid, there would not be a problem. I added a fiddle how model proxy works with store and etc. Hope it helps. If the fiddle does not explain your problem, please change the fiddle codes. So, we can understand what your problem exactly. Here is the fiddle: https://fiddle.sencha.com/#fiddle/tvq
Ext.define('model.Users', {
extend: 'Ext.data.Model',
fields: [
{ name: 'Name', type: 'string'},
{ name: 'City', type: 'string'},
{ name: 'Country', type: 'string'},
],
//idProperty: 'Name',
proxy: {
type: 'ajax',
rootProperty: 'records',
rootUrl: 'users', // used when updating proxy url
url: 'users',
reader: {
type: 'json',
rootProperty: 'records'
}
}
}); //model
var modelExt = Ext.create('model.Users', { Name: 'Ernst Handel'});
var storeExt = Ext.create('Ext.data.Store', {
requires: 'model.Users',
model: 'model.Users'
});
modelExt.load({
scope: this,
success: function(record) {
var colObjects = [];
Ext.each(Object.keys(record.data), function(key) {
colObjects.push({
text: key,
dataIndex: key
});
});
storeExt.loadData([record]);
//console.log(record, storeExt);
var grid = Ext.create('Ext.grid.Panel', {
store: storeExt,
columns: colObjects,
renderTo: Ext.getBody()
});
},
failure: function (err) {
}
});
Create model like this and then use.
var newMap = Ext.create('Ext.data.model', {
identifier : "something"
});
Add a new file in Model folder named like MappingModel.js and define model like this.
Ext.define('hds.model.MappingModel', {
extend: 'Ext.data.Model',
fields: [
'something'
]
});
Add this in app.js and then use MappingModel in your dynamic store.

Save nested form data back to server in ExtJS

I have a Model that contains an association to another Model. I am able to display the nested data into a form by using the mapping attribute on the field. Example:
Ext.define('Example.model.Request', {
extend: 'Ext.data.Model',
fields: [
{
name: 'id',
type: Ext.data.Types.NUMBER,
useNull: false
}
{
name: 'plan_surveyor',
mapping: 'plan.surveyor',
type: Ext.data.Types.STRING
}
],
associations: [
{type: 'hasOne', associationKey: 'plan', getterName:'getPlan', model: 'Specs.model.Plan'}
],
proxy: {
type: 'direct',
api: {
read: requestController.load,
update: requestController.update,
},
reader: {
type: 'json',
root: 'records'
},
writer: {
type: 'json',
writeAllFields: true,
nameProperty: 'mapping'
}
}
});
Using this method, I can display the plan.surveyor value in the form by reference plan_surveyor. I call Form.loadRecord(model) to pull the data from the model into the form.
However, now that I'm trying to send the data back to the server, I get the error:
Error performing action. Please report the following: "Unrecognized field "plan.surveyor"
I am attempting to save to the server by first calling Form.updateRecord(model), then model.save(). Is there a way to have the Writer understand that 'plan.surveyor' is not a property name but instead to properly handle nesting?
Am I doing this the right way to start with, or should I just be handling the setting of the form data and loading back into the model in a more manual fashion? It seems that nested data is not all that well supported in general - any recommendations?
Ext.define('Example.model.Request', {
extend: 'Ext.data.Model',
fields: [
{
name: 'id',
type: Ext.data.Types.NUMBER,
useNull: false
}
{
name: 'plan_surveyor',
mapping: 'plan.surveyor',//change to 'plan_surveyor'
type: Ext.data.Types.STRING
}
],
change that show in comment ,because data index is given in above format because ur give ur format thata time that is not dataindex it's a column or extjs preparatory ,so please change that may it's work well
it's not work u will send hole code

Sencha Touch 2 array parsing

I'm new to sencha touch and I'm trying to parse an array of data (this doesn't seem like an uncommon use case but I can't find anything about it online). I followed the sencha ext.data.reader.json doc on nested json, but it doesn't work. Here are my models:
Search Results (to hold multiple search results):
Ext.define('GS.model.SearchResults', {
extend: 'Ext.data.Model',
autoLoad: true,
config: {
fields: [
{name: 'query', type: 'string'},
],
hasMany : {model: 'SearchResult', name: 'results'},
}
});
And search result, to hold an individual search result
Ext.define('GS.model.SearchResult', {
extend: 'Ext.data.Model',
config: {
fields: [
{name: 'id', type: 'int'},
{name: 'name', type: 'string'}
],
belongsTo: 'SearchResults'
}
});
Then in my controller, I have this code:
var store = Ext.create('Ext.data.Store', {
autoLoad: "true",
model: "GS.model.SearchResults",
proxy:
{
type: 'ajax',
url : 'www.someurl.com/?query=somequery',
reader: {
type: 'json'
}
}
});
store.load({
callback: function() {
console.log("Done Loading");
var root = store.first();
console.log("Results for " + root.get('query')); //this prints correctly
console.log(root.results());//THIS IS THE LINE IM INTERESTED IN
console.log(root.raw.results);//this weirdly works
//now I want to print each search results name
root.results().each(function(result) {
console.log("Song: " + result.get('name'));
});
}
});
}
When I log root.results(), I get
Uncaught TypeError: Object [object Object] has no method 'results'
This is exactly how they do it in the docs, so does anyone know why this isnt working???
Edit: Here is the doc I was following
The best way to check your error is to debug in chrome console. After callback you will find your records in root.raw or root.data.
I use to debug in chrome console and write the required code.
After some painful trial and error, I figured it out. In the tutorial, they used unconventional model name, but in my case I needed to use the fully qualified one
So to fix I needed to change
hasMany : {model: 'SearchResult', name: 'results'},
to
hasMany : {model: 'GS.model.SearchResult', name: 'results'},
and same with my deeper model like this:
belongsTo: 'GS.model.SearchResults'
Tough error to catch, but I hope this can help someone else in my position

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