ruby on rails - Mongoid Scope Check If Array Field Contains Value -

The solution to this question can be very easy, but I'm waving around with no answer.

I am using quietly in my Rail 4.1.4 app. I have a model in which an array Field which will house string values.

I want a Mongoyeds to get examples in the scope of the model , where it is specific in the array field String value, which is given as a parameter for the scope. Suppose we have this model:

  class Monogel in some models :: documents are included in the moguid :: timestamp field: some_array, type: array, default: array.non scope: some_scope, - & gt;  field  does not work, because obviously,  MongoDB   Em> $ elemMatch  needs to get  criteria  as  value . But, how to say  benchmark  that the element should be equal to the given value. ???  
 How to write a very simple scope but a clue? ??  
 Regards !!! thank you in advanced.   
 
 
 You are working a lot more if a field contains an array, you can search it As if it was not an array. For example, if you have a document:  
  {some_array: ['ou', 'is', 'pancakes', 'home?' ]}   
 and you do a query like this:  
  where (: some_array => 'pancakes')   
 You will find that document. You do not need or are not anything complicated here; You can pretend that the array has a single value for simple questions like yours:  
  scope: some_scope, - & gt; (Value) {where (: some_array = & gt; value)}   
 You just need to join  $ elem match  If you want to apply several conditions in the element, then  $ elemMatch  document:  
  result: {$ elemMatch: {$ gte: 80, $ lt: 85}} // ^^^^^^^ array ^^^^^^^^ ^^^^^^^^^^^^^ many terms   
 do not mind , Existing mangaodi docs are not quite clear on this stuff (or at least I can not get a clear explanation. )