forest-cli
Version:
The Lumberjacks' toolbelt is the Forest CLI which makes easy to manage your back office application directly from the terminal.
36 lines • 4.82 kB
JavaScript
const P = require('bluebird');
const { findCollectionMatchingSamples, filterReferenceCollection, } = require('../../../../utils/mongo-collections');
const OBJECT_ID = 'Mongoose.Schema.Types.ObjectId';
const SAMPLE_COUNT_TO_FETCH = 10;
const pickSampleValues = (databaseConnection, collectionName, field) => databaseConnection
.collection(collectionName)
.aggregate([
{ $match: { [field.name]: { $ne: null } } },
{ $sample: { size: SAMPLE_COUNT_TO_FETCH } },
{ $project: { _id: false, value: `$${field.name}` } },
])
.toArray()
.then(samples => samples.map(sample => sample.value));
const buildReference = (collectionName, referencedCollection, field) => {
if (referencedCollection) {
return {
from: { collectionName, fieldName: field.name },
to: { collectionName: referencedCollection },
};
}
return null;
};
const detectReference = (databaseConnection, field, collectionName) => pickSampleValues(databaseConnection, collectionName, field)
.then(samples => findCollectionMatchingSamples(databaseConnection, samples))
.then(matches => filterReferenceCollection(matches))
.then(referencedCollection => buildReference(collectionName, referencedCollection, field));
const detectReferences = (databaseConnection, fields, collectionName) => {
const objectIdFields = fields.filter(field => field.type === OBJECT_ID);
return P.mapSeries(objectIdFields, objectIdField => detectReference(databaseConnection, objectIdField, collectionName)).then(references => references.filter(reference => reference));
};
const applyReferences = (fields, references) => references.forEach(reference => {
const field = fields.find(searchedField => searchedField.name === reference.from.fieldName);
field.ref = reference.to.collectionName;
});
module.exports = { detectReferences, applyReferences };
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