A FeathersJS hook to implement `findOrCreate`

example-usage.js

const findOrCreate = require('./find-or-create-hook.js')

app.service('messages').hooks({
  before: {
    create: [findOrCreate()]
  }
})

find-or-create-hook.js

'use strict';
/**
 * If the record doesn't already exist, create it and return it to the user.
 */
module.exports = function(){
  return function(hook){
    const service = hook.app.service('/api/records');

    return new Promise(function(resolve, reject){
      let params = {
        query: hook.params.data,
        user: hook.params.user
      };

      return service.find(params)
        .then(response => {
          // If a service has pagination enabled or not, handle either way.
          if (response.length || response.data && response.data.length) {
            // Set the result to skip the call to `create` if a record was found.
            hook.result = response.data ? response.data[0] : response[0];
          }
        
          return hook;
        });
  };
};