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model.js
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const fs = require ('fs');
const DB_FILENAME = "quizzes.json";
let quizzes = [
{
question: "Capital de Italia",
answer: "Roma"
},
{
question: "Capital de Francia",
answer: "París"
},
{
question: "Capital de España",
answer: "Madrid"
},
{
question: "Capital de Portugal",
answer: "Lisboa"
}
];
const load =() =>{
fs.readFile(DB_FILENAME, (err, data) => {
if(err) {
//La primera vez no existe el fichero
if(err.code === "ENOENT"){
save(); //valores iniciales
return;
}
throw err;
}
let json = JSON.parse(data);
if(json){
quizzes = json;
}
});
};
const save = () => {
fs.writeFile(DB_FILENAME,
JSON.stringify(quizzes),
err => {
if(err) throw err;
}
);
};
exports.count = () => quizzes.length;
exports.add = (question, answer) =>{
quizzes.push({
question: (question || "").trim(),
answer: (answer || "").trim()
});
save();
};
exports.update = (id, question,answer) => {
const quiz = quizzes[id];
if(typeof quiz === "undefined"){
throw new Error(`El valor del parametro id no es válido`);
}
quizzes.splice( id, 1, {
question: (question|| "").trim(),
answer: (answer || "").trim()
});
save();
};
exports.getAll = () => JSON.parse(JSON.stringify(quizzes));
exports.getByIndex = id => {
const quiz = quizzes[id];
if (typeof quiz === "undefined"){
throw new Error(`El valor del parámetro id no es válido`);
}
return JSON.parse(JSON.stringify(quiz));
};
exports.deleteByIndex = id =>{
const quiz = quizzes[id];
if (typeof quiz === 'undefined'){
throw new Error(`El valor del parámetro id no es válido`);
}
quizzes.splice(id,1);
save();
};
//Carga los quizzes almacenados en el fichero
load();