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worker.js
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worker.js
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const modelObj = require('./db');
const _ = require('lodash');
const Papa = require('babyparse');
/**
*
*
* DB writer and reader class with automatically generated methods
* **These methods are created automatically based off what it defined by bookshelf**
* @class Worker
*/
function Worker() {
let quizzes = Object.keys(modelObj);
quizzes.forEach(quiz => {
const db = modelObj[quiz];
let models = Object.keys(db._models);
models.forEach(modelName => {
let Model = db.model(modelName);
const methods = [
`${quiz}.create${modelName}`,
`${quiz}.update${modelName}`,
`${quiz}.delete${modelName}`,
`${quiz}.find${modelName}`,
`${quiz}.query${modelName}`,
`${quiz}.raw${modelName}`,
`${quiz}.all${modelName}`
];
/**
*
*
*
* Create a new Model in the DB
* @method Worker#createModel
* @param {any} data - model to be created
* @returns {Promise} The saved model
* @fulfill {Object}
* @reject {Error}
* @example
* whichEnglish.createUser({ name: "Methuselah", age: 1000 })
*/
this[`${quiz}.create${modelName}`] = function(data) {
return new Model(data).save()
.then(data => {
return data.toJSON();
})
.catch(error => {
console.log(error);
});
};
/**
*
*
* @method Worker#findModel
* @param {number} id - The id of the model looking for
* @param {string[]} [relations] - an array of related models to fetch
* @returns {Promise}
* @fulfill {Object} - The found model
* @reject {Error}
* @example
* whichEnglish.findUser(1, ['posts'])
*/
this[`${quiz}.find${modelName}`] = function(id, relations) {
if (Array.isArray(relations) && relations.length) {
return Model.where({ id: id })
.fetch({ withRelated: relations })
.then(data => {
if (data) {
return data.toJSON();
}
return null;
})
.catch(error => {
console.log(error);
});
}
return Model.where({ id: id }).fetch().then(data => {
if (data) {
return data.toJSON();
}
return null;
})
.catch(error => {
console.log(error);
});
};
/**
*
*
* @method Worker#updateModel
* @param {number} id - the id of the model being updated
* @param {Object} data - the data to update
* @returns {Promise}
* @fulfill {Object} - The newly updated model
* @reject {Error}
* @example
* whichEnglish.updateUser(1, { age: 969 })
*/
this[`${quiz}.update${modelName}`] = function(whereObj, data) {
return Model.where(whereObj)
.save(data, { patch: true })
.then(updated => updated.toJSON())
.catch(error => {
console.log(error);
});
};
/**
*
*
* @method Worker#deleteModel
* @param {Number} id - the id of the model to be deleted
* @returns {Number} 0 if success
* @example
* whichEnglish.deleteUser(1);
*/
this[`${quiz}.delete${modelName}`] = id => {
return new Model({ id }).destroy().then(model => {
return 0;
})
.catch(error => {
console.log(error);
});
};
/**
*
*
* @method Worker#queryModel
* @param {string[][]} query - a knex.js query array see http://knexjs.org/#Builder
* @param {string[]} relations - an Array of relations
* @return {Promise}
* @fulfill {Object[]} - An array of models returned
* @reject {Error}
* @example
* whichEnglish.queryModel([
* ['where', 'other_id', '=', '5'],
* ['where', 'name', '=', 'foo']
* ],
* ['posts']
* )
*/
this[`${quiz}.query${modelName}`] = (query, relations) => {
const p = query.reduce((prev, curr) => {
return prev.query.apply(prev, curr);
}, Model);
if (relations) {
return p
.fetchAll({ withRelated: relations })
.then(data => data.toJSON())
.catch(error => {
console.log(error);
});
}
return p.fetchAll().then(data => data.toJSON())
.catch(error => {
console.log(error);
});
};
/**
* Allows raw queries on DB
* @method Worker#rawModel
* @param {String[][]} query - a raw knexjs query array
* @returns {Promise}
* @fulfill {Object[]} - an array of results
* @reject {Error}
* @example
* whichEnglish.rawUser([
* ['where', 'name', '=', 'Methuselah'],
* ['where', 'age', '>', 900 ],
* ])
*/
this[`${quiz}.raw`] = query => {
return db.knex.raw(query).then(resp => resp.rows)
.catch(error => {
console.log(error);
});
};
/**
* Return all models in DB
* @method Worker#allModels
* @returns {Promise}
* @fulfill {Object[]} - all models in DB
* @reject {Error}
* @example
* allUsers()
*/
this[`${quiz}.all${modelName}s`] = () => {
return Model.fetchAll().then(data => data.toJSON())
.catch(error => {
console.log(error);
});
};
/**
* @method Worker#getInitialQuestions
* @returns {Promise}
* @example
* whichEnglish.getInitialQuestions()
* @fulfill {Object[]} - questions for that Trial
* @reject {Error}
*/
this[`${quiz}.getInitialStimulus`] = () => {
return db
.model('Stimulus')
.forge()
.query(qb => {
qb.offset(0).limit(1);
})
.fetchAll()
.then(data => {
return db.model('User').forge().save().then(user => {
const json = data.toJSON();
return {
stimulus: json,
user: user.toJSON()
};
});
})
.catch(error => {
console.log(error);
});
};
this[`${quiz}.getAllStimuli`] = () => {
return db
.model('Stimulus')
.forge()
.query(qb => {
qb.offset(0);
})
.fetchAll()
.then(data => {
return db.model('User').forge().save().then(user => {
const json = data.toJSON();
return {
stimuli: json,
user: user.toJSON()
};
});
})
.catch(error => {
console.log(error);
});
};
// get all stimuli in ascending order by int columb num_responses
// this[`${quiz}.getAllStimuliAsc`] = () => {
// return db
// .model('Stimulus')
// .forge()
// .orderBy('num_responses', 'ASC')
// .query(qb => {
// qb.offset(0);
// })
// .fetchAll()
// .then(data => {
// return db.model('User').forge().save().then(user => {
// const json = data.toJSON();
// return {
// stimuli: json,
// user: user.toJSON()
// };
// });
// })
// .catch(error => {
// console.log(error);
// });
// };
// return all stimuli as an array of the actual stims, as opposed to an array of db objects
// this[`${quiz}.getAllStimuliArr`] = () => {
// return db
// .model('Stimulus')
// .forge()
// .query(qb => {
// qb.offset(0);
// })
// .fetchAll()
// .then(data => {
// const json = data.toJSON();
// let arr = [];
// for (let i = 0; i < json.length; i++) {
// arr.push(json[i]['stimulus']);
// }
// return db.model('User').forge().save().then(user => {
// return {
// stimuli: arr,
// user: user.toJSON()
// };
// });
// })
// .catch(error => {
// console.log(error);
// });
// };
/**
* Returns user responses in csv format
* @method Worker#getResponseCsv
* @returns {Promise}
* @fulfill {Object[]} - an array of response data
* @reject {Error}
* @todo Make this query on the trial Name
*/
this[`${quiz}.getResponseCsv`] = () => {
return db
.knex(`${quiz}_users`)
.join(
`${quiz}_responses`,
`${quiz}_responses.userId`,
'=',
`${quiz}_users.id`
)
.join(
`${quiz}_choices`,
`${quiz}_choices.id`,
'=',
`${quiz}_responses.choiceId`
)
.join(
`${quiz}_questions`,
`${quiz}_choices.questionId`,
'=',
`${quiz}_questions.id`
)
.select(
`${quiz}_users.*`,
`${quiz}_questions.prompt`,
`${quiz}_choices.imageUrl`,
`${quiz}_choices.displayText`,
`${quiz}_choices.correct`,
`${quiz}_choices.type`
)
.then(data => {
return Papa.unparse(data);
})
.catch(error => {
console.log(error);
});
};
});
/**
*
* Sets a users Languages
* @method Worker#setUserLanguages
* @param {number} userId - the name of the id to set
* @param {Object} set
* @param {String[]} set.primaryLanguages - the user's primary Languages
* @param {String[]} set.nativeLanguages - the user's native Languages
* @returns {Promise}
* @fulfill {Object} - the user with their languages
* @rejects {Error}
* @example
* setUserLanguages(1, {
* primaryLanguages: ["Hebrew", "Aramaic"],
* nativeLanguages: ["Hebrew"]
* })
*/
this[`${quiz}.setUserLanguages`] = (
userId,
{ primaryLanguages, nativeLanguages }
) => {
return Promise.all(
primaryLanguages.map(lang =>
db.knex
.raw(
`INSERT into "${quiz}_userLanguages" ("userId", "primary", "native", "languageId") SELECT ?, ?, ?, id from ${quiz}_languages WHERE name = ? RETURNING *`,
[userId, true, false, lang]
)
.then(resp => resp.rows)
)
).then(data => {
return Promise.all(
nativeLanguages.map(lang =>
db.knex
.raw(
`INSERT into "${quiz}_userLanguages" ("userId", "primary", "native", "languageId") SELECT ?, ?, ?, id from ${quiz}_languages WHERE name = ? RETURNING *`,
[userId, false, true, lang]
)
.then(resp => resp.rows)
)
).then(stuff => {
return db
.model('User')
.where({ id: userId })
.fetch({ withRelated: ['userLanguages.language'] })
.then(userData => userData.toJSON());
})
.catch(error => {
console.log(error);
});
});
};
/**
* Get the results from the DB
* @method Worker#getResults
* @param {number} userId - the user whose results you are grabbing
* @returns {Promise}
* @fulfill {Object[]} - an array of the top 3 languages for this user
* @rejects {Error}
*/
this[`${quiz}.getResults`] = userId => {
return Promise.resolve([
{
name: 'English'
},
{
name: 'Spanish'
}
]);
// something in this results calculation is throwing an error if there are no other users data in the system.
// probably not an issue due to the fact that how we calculate results in real life is very different than this snippet.
return db
.knex('users')
.select('responses.*')
.join('responses', 'responses.userId', '=', 'users.id')
.then(choices => {
let obj = {};
choices.forEach(response => {
if (Array.isArray(obj[response.userId])) {
obj[response.userId].push(response.choiceId);
} else {
obj[response.userId] = [response.choiceId];
}
});
return obj;
})
.then(keymap => {
let userArray = keymap[userId];
if (userArray) {
delete keymap[userId];
let output = [];
userArray = userArray.sort();
for (let prop in keymap) {
keymap[prop] = keymap[prop].sort();
output.push({
match: intersect_safe(userArray, keymap[prop].sort()).length,
userId: prop
});
}
return output;
}
})
.then(output => {
if (output) {
const users = _.take(_.orderBy(output, 'match', 'desc'), 3);
return db
.knex('users')
.distinct('languages.name')
.select('languages.name')
.whereIn('users.id', users.map(u => u.userId))
.join('userLanguages', 'users.id', 'userLanguages.userId')
.join('languages', 'userLanguages.languageId', 'languages.id');
}
return {};
});
};
});
}
// returns the intersection between 2 arrays
function intersect_safe(a, b) {
let ai = 0, bi = 0;
let result = [];
while (ai < a.length && bi < b.length) {
if (a[ai] < b[bi]) {
ai++;
} else if (a[ai] > b[bi]) {
bi++;
} else {
/* they're equal */ result.push(a[ai]);
ai++;
bi++;
}
}
return result;
}
module.exports = new Worker();