Baseparams in a store does not work

[arpho]

Hi, I have a grid with paging
the strore I am using sends POST request to a file PHP, I need to filter my db, so in the proxy of my store I use

baseParams : { provincia:'TO'}

for the moment I am usig 'TO' just for test, when it will be working, I' l put some variable, my problem is that the store does not send the parameter 'provincia', it puts only the parameters for the listing: START and LIMIT, what is wrong
these is my store

var SpaStore = Ext.create('Ext.data.Store', {
    
    
        autoLoad: {start: 0, limit: myPageSize, provincia: 'to'},
        autoSync: true,
        
         model:'SPA',
         
        proxy: {
            type: 'ajax',
            url: spaQuery,
            actionMethods :{
                read   : 'POST'
            },
            reader: {
                type: 'json',
                root: 'data',
                totalProperty : 'totalProperty', 
                baseParams : { provincia:'TO'}
            },
            writer: {
                type: 'json'
            }
        },
        listeners: {
            write: function(postitStore, operation){
                var record = operation.getRecords()[0],
                name = Ext.String.capitalize(operation.action),
                verb;
                
                record = operation.records[0];    
                if (name == 'Destroy') {
                    
                    verb = 'Destroyed';
                } else {
                    verb = name + 'd';
                }
              //  Ext.example.msg(name, Ext.String.format("{0} Postit id: {1}", verb, record.getId()));
                
            }
        }
    });

and my grid

var grid = Ext.create('Ext.grid.Panel', {
        store: SpaStore,
        stateful: true,
        stateId: 'stateGrid',
        dockedItems: [{
        xtype: 'pagingtoolbar',
        store: SpaStore,   // same store GridPanel is using
        dock: 'bottom',
        displayInfo: true,
        stripeRows:true,
        resizeble:true,
        draggable: true,
        

    }],
        columns: [
            {
                text     : 'nome1',
                flex     : 1,
                sortable : false,
                dataIndex: 'nome1'
            },
            {
                text     : 'nome2',
                width    : 1,
                sortable : true,
            //    renderer : 'usMoney',
                dataIndex: 'nome2'
            },
            {
                text     : 'indirizzo',
                width    : 75,
                sortable : true,
       //         renderer : change,
                dataIndex: 'indirizzo'
            },
            {
                text     : 'comune',
                width    : 75,
                sortable : true,
                //renderer : pctChange,
                dataIndex: 'comune'
            },
            {
                text     : 'provincia',
                width    : 85,
                sortable : true,
                dataIndex: 'provincia'
            },
            /*{
                xtype: 'tel1',
                width: 50,
                sortable : true,
               
                dataIndex:'tel1'
            }*/
        ],
        height: 350,
        width: 1200,
        title: 'SPA',
        renderTo: document.body,
        viewConfig: {
            stripeRows: true
        }
    });

what I am doing wrong?
any help is welkome, thanks in advance

[tvanzoelen]

You must use the extraParams of the proxy instead. baseParams doesn't exists anymore

[arpho]

I changed to extraParams
it does not work

[lucasguaru]

thisGrid.getStore().getProxy().extraParams = {
    param1 : '',
    param2 : ''
};
thisGrid.getStore().load();