Repo pattern for Meteor

repo.js

const root = this;

Repo = {
  insert(collection) {
    const id = root[collection].insert(params);
    if (id) {
      return ['ok', root[collection].findOne(id)];
    } else {
      return ['error', 'Error creating document'];
    }
  },

  all(collection) {
    const items = root[collection].find().fetch();
    if (items) {
      return ['ok', items];
    } else {
      return ['error', 'Error finding documents'];
    }
  },

  update(collection, id, data) {
    const count = root[collection].update({_id: id}, {$set: data});
    if (count) {
      return ['ok', root[collection].findOne(id)];
    } else {
      return ['error', 'Error finding documents'];
    }
  },

  $update(collection, id, data) {
    const count = root[collection].update({_id: id}, {$set: data});
    if (count) {
      return root[collection].findOne(id);
    } else {
      throw new Meteor.Error(400, 'Update failed');
    }
  },

  get(collection, id) {
    return root[collection].findOne(id);
  },

  $get(collection, id) {
    const doc = root[collection].findOne(id);
    if (doc) {
      return doc;
    } else {
      throw new Meteor.Error(404, 'Record not found');
    }
  },

  $delete(collection, id) {
    const count = root[collection].remove(id);
    if (count) {
      return ['ok'];
    } else {
      throw new Meteor.Error(404, 'Record not found');
    }
  },
}