import { check } from 'meteor/check';
import { Meteor } from 'meteor/meteor';
import { _ } from 'lodash';
import { Slugs } from '../slug/SlugCollection';
import BaseCollection from './BaseCollection';
/**
* BaseSlugCollection is an abstract superclass for use by entities that have a slug.
* It provides an API where the user can provide either a slug or docID (or document-specifying object).
* Note it does not define a constructor; subclasses should invoke super(type, schema) to get the
* BaseCollection constructor.
* @memberOf api/base
* @extends api/base.BaseCollection
*/
class BaseSlugCollection extends BaseCollection {
/**
* Returns the docID associated with instance, or throws an error if it cannot be found.
* If instance is an object with an _id field, then that value is checked to see if it's in the collection.
* If instance is the value for the username field in this collection, then return that document's ID.
* If instance is a docID, then it is returned unchanged. If instance is a slug, its corresponding docID is returned.
* @param { String } instance Either a valid docID or a valid slug string.
* @returns { String } The docID associated with instance.
* @throws { Meteor.Error } If instance is not a docID or a slug.
*/
getID(instance) {
// console.log('BaseSlugCollection.getID(%o)', instance);
let id;
// If we've been passed a document, check to see if it has an _id field and make instance the value of _id.
if (_.isObject(instance) && instance._id) {
instance = instance._id; // eslint-disable-line no-param-reassign
}
// If instance is the value of the username field for some document in the collection, then return its ID.
const usernameBasedDoc = this._collection.findOne({ username: instance });
if (usernameBasedDoc) {
return usernameBasedDoc._id;
}
// Otherwise see if we can find instance as a docID or as a slug.
try {
id = (this._collection.findOne({ _id: instance })) ? instance : this.findIdBySlug(instance);
} catch (err) {
throw new Meteor.Error(`Error in ${this._collectionName} getID(): Failed to convert ${instance} to an ID.`,
'', Error().stack);
}
return id;
}
/**
* Returns the docIDs associated with instances, or throws an error if any cannot be found.
* If an instance is a docID, then it is returned unchanged. If a slug, its corresponding docID is returned.
* If nothing is passed, then an empty array is returned.
* @param { String[] } instances An array of valid docIDs, slugs, or a combination.
* @returns { String[] } The docIDs associated with instances.
* @throws { Meteor.Error } If any instance is not a docID or a slug.
*/
getIDs(instances) {
let ids;
try {
ids = (instances) ? instances.map((instance) => this.getID(instance)) : [];
} catch (err) {
throw new Meteor.Error(`Error in getIDs(): Failed to convert one of ${instances} to an ID.`, '', Error().stack);
}
return ids;
}
/**
* Removes the passed instance from its collection.
* Also removes the associated Slug.
* Note that prior to calling this method, the subclass should do additional checks to see if any dependent
* objects have been deleted.
* @param { String } instance A docID or slug representing the instance.
* @throws { Meteor.Error} If the instance (and its associated slug) cannot be found.
*/
removeIt(instance) {
// console.log('%o.removeIt(%o)', this._type, instance);
const docID = this.getID(instance);
const doc = super.findDoc(docID);
check(doc, Object);
if (Slugs.isDefined(doc.slugID)) {
const slugDoc = Slugs.findDoc(doc.slugID);
check(slugDoc, Object);
Slugs.removeIt(slugDoc);
}
super.removeIt(doc);
}
/**
* Return true if instance is a docID or a slug for this entity.
* @param { String } instance A docID or a slug.
* @returns {boolean} True if instance is a docID or slug for this entity.
*/
isDefined(instance) {
return (super.isDefined(instance) || this.hasSlug(instance));
}
/**
* Returns true if the passed slug is associated with an entity of this type.
* @param { String } slug Either the name of a slug or a slugID.
* @returns {boolean} True if the slug is in this collection.
*/
hasSlug(slug) {
return (!!(this._collection.findOne({ slug })) || Slugs.hasSlug(slug));
}
/**
* Return the docID of the instance associated with this slug.
* @param { String } slug The slug (string or docID).
* @returns { String } The docID.
* @throws { Meteor.Error } If the slug cannot be found, or is not associated with an instance in this collection.
*/
findIdBySlug(slug) {
return Slugs.getEntityID(slug);
}
/**
* Returns a list of docIDs associated with the instances associated with the list of slugs.
* @param { Array } slugs A list or collection of slugs.
* @return { Array } A list of docIDs.
* @throws { Meteor.Error } If the slug cannot be found, or is not associated with an instance in this collection.
*/
findIdsBySlugs(slugs) {
return slugs.map(slug => this.findIdBySlug(slug));
}
/**
* Returns the instance associated with the passed slug.
* @param { String } slug The slug (string or docID).
* @returns { Object } The document representing the instance.
* @throws { Meteor.Error } If the slug cannot be found, or is not associated with an instance in this collection.
*/
findDocBySlug(slug) {
return this.findDoc(this.findIdBySlug(slug));
}
/**
* Returns the slug name associated with this docID.
* @param docID The docID
* @returns { String } The slug name
* @throws { Meteor.Error } If docID is not associated with this entity.
*/
findSlugByID(docID) {
this.assertDefined(docID);
return Slugs.findDoc(this.findDoc(docID).slugID).name;
}
}
/**
* Base class for collections with slugs.
*/
export default BaseSlugCollection;
Source