proposta.js

Ext.define("Book", {
  extend: "Ext.data.Model",
  fields: ["id", "title", 
           {name: "author", mapping: "author.name"}, 
           {name: "texto", convert: function(v, record){
               var texto = record.raw.pages_content_highlighted;
               return texto;
            }},
           ],
    proxy: {
        format: "json",
        type: "rest",
        url: "/books"
    },
    actions: {
        search: "/books/search"
    }
})
store = Ext.create("Ext.data.Store", {
    model: "Book"
})

Book.search({ params: {query: "kent beack"}, callback: function(){}})