ruby on rails - how create object from query with includes -

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Platforms and platforms are associated with the Caribbean as_to has_many

I have such a query for my DB

I want to use every ID of the platform associated with the p-variable and want to add it: 

  p = platform_category.where (Params [: platform_category_ids]). In the new object, like this:  
  p.each {| Plat_cat | Campaign.create (..., some_id: plat_cat.platform.id)}  
 
 But PlatformCategory has many platforms and here I want to call everyone at block with plat.cat I do not think it's like Ruby. 
 
  UPD  Everything is fine when I just array [1,2,3,4] like the array, but with the array in the parameter  'NoMethodError: The 'included' method for the array

Are you searching for this? 

  p = platform_category.where (id: [1,2,3,4]). () Join platforms Selection ('Platform.)

And then: 

  p.each {| Plat_cat | | Campaign.create (..., some_id: plat_cat.id)}

UPDATE : Since find to contain method because it returns an array after the query (if you pass an array as the argument) you can do this to avoid such a scenario: 

  P = PlatformCategory.joins (: platform). Selection ('platform.') Search ([1,2,3,4])

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