Support an "includes" rule type

[mayank23]

Hola! 😃

It would be nice if flipr supported an "includes" rule type.

For example, a rule which just checks if the value passed to it is included in the extractedInput. Could also create another rule for shallow prop checks in objects , e.g) has.

E.g)

foodPreference:
  values:
    - value: You Like Apples
      food: apple
    - value: You Like Oranges
      food: orange

Rule Definition

{
  type: 'includes',
  input: (input) => input.foodsList,
  propertyName: 'food'
}

execute-rule-includes.js

'use strict';

var _ = require('lodash');

module.exports = executeRuleIncludes;

var MATCH_FOUND = true;

function executeRuleIncludes(input, rule, values, cb) {
  var firstMatch = _.find(values, function(value){
    var property = value[rule.property];
    if(_.isUndefined(property))
      return false;
    return _.includes(input, property);
  });
  if(firstMatch)
    cb(MATCH_FOUND, firstMatch.value);
  else
    cb();
}

Finally, we would need to update

node-flipr/lib/rules/get-input-from-rule.js

Line 23 in 2b69da5

if(!_.isString(result) && !_.isBoolean(result) && !_.isNumber(result))

to allow arrays an maybe assert that an array is returned by the input function for an 'includes' rule.

we can list out the exact semantics in the README for each rule so it's easier to see how values are compared by flipr

Thoughts?

[gshively11]

Seems like a valuable feature to me, I'd be happy to accept a PR for this.