How to set aliases and then still affect the return type for queries in json formats for Cake 3.x?

问题

Situation

Using cake 3.2.4

and the plugin Crud 4.2

for the purpose of producing an API feed

What code did I use at first?

  $this->Crud->on('beforePaginate', function(Event $event) use ($conditions) {
        $this->paginate['conditions'] = $conditions;
        $this->paginate['limit'] = 100;
        $this->paginate['fields'] = [
            'id', 'title', 
             'start_date', 
            'end_date', 
            'revenue', 
            'total_costs', 'collections'
        ];
    });

What am I getting as json feed?

"success": true,
"data": [
    {
        "id": 789,
        "title": "9143 - Asia Summit",
        "start_date": "2016-03-02T09:00:00+0800",
        "end_date": "2016-03-04T18:45:00+0800",
        "revenue": 1000000.00,
        "total_costs": 0,
        "collections": 50000.00
    },
    {
        "id": 15,
        "title": "9144 - 10th  Exhibition",
        "start_date": "2016-03-21T09:00:00+0800",
        "end_date": "2016-03-23T17:00:00+0800",
        "revenue": 2000000.00,
        "total_costs": 0,
        "collections": 50000.00
    }]}

What did I then do?

I wanted to return as aliases so I did the following

  $this->Crud->on('beforePaginate', function(Event $event) use ($conditions) {
        $this->paginate['conditions'] = $conditions;
        $this->paginate['limit'] = 100;
        $this->paginate['fields'] = [
            'id', 'title', 
            'start' => 'start_date', 
            'end' => 'end_date', 
            'revenue', 
            'costs' => 'total_costs', 'collections'
        ];
    });

What did I now get?

{
"success": true,
"data": [
    {
        "id": 789,
        "title": "9143 - Asia Summit",
        "start": "2016-03-02 09:00:00",
        "end": "2016-03-04 18:45:00",
        "revenue": 1000000.00,
        "costs": "0.00",
        "collections": 50000.00
    },
    {
        "id": 15,
        "title": "9144 - 10th Exhibition",
        "start": "2016-03-21 09:00:00",
        "end": "2016-03-23 17:00:00",
        "revenue": 2000000.00,
        "costs": "0.00",
        "collections": 50000.00
    },

So what's wrong?

I get the aliases I wanted, but then the costs has now become a string.

The datetime no longer shows the timezone.

How do I force the fields of the objects in the json feed to be of a certain type whilst keeping the aliases?

回答1:

Realise that in 3.2 you can use addDefaultTypes to affect the query directly

See Cakephp-3.x: How to change the data type of a selected alias?

Realise that you can access the query from $event when using Crud

See http://crud-view.readthedocs.org/en/latest/basic-usage.html?highlight=query#providing-associations-to-be-displayed

Use the types datetime, and decimal

Put it altogther and you get:

$this->Crud->on('beforePaginate', function(Event $event) use ($conditions) {
        $this->paginate['conditions'] = $conditions;
        $this->paginate['limit'] = 100;
        $this->paginate['fields'] = [
            'id', 'title', 
            'start' => 'start_date', 
            'end' => 'end_date', 
            'revenue', 
            'costs' => 'total_costs', 'collections'
        ];
        $paginationQuery  = $event->subject()->query;

        $paginationQuery
        ->selectTypeMap()
        ->addDefaults([
            'start' => 'datetime',
            'end' => 'datetime',
            'costs' => 'decimal'
        ]);

    });

来源：https://stackoverflow.com/questions/35972918/how-to-set-aliases-and-then-still-affect-the-return-type-for-queries-in-json-for