node.js - Fetch posts by category with bookshelf.js -

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I am using bookshelf.js as my ORM for node. I have 2 models 

  post = bookshelf. Model Extension ({tableName: 'posts', categories: function ()} This return.belongsToMany ('category');}}); Category = bookshelf.model.extend ({tableName: 'Categories', Post: Function ()} Return to it. Belgstman ('Post');}});   
 They are related to the categories_pause table, so it's many of the many relationships.  
 Now I want the user to be able to see all the positions in certain categories. But I just do not want to post all, I should put a score on the page. But I am unable to get the overall posts under the specific category, it always returns the total positions present in the system.  
 I have tried this  code.forge ({id: id}) (). () () () () () () () () () () () ();}  But unlike the  post  table =  id  Total posts under category identified by this is also possible, or should I make a supporting method which is directly  categories_posts  table  
 thanks   < P> 
 
  category. Forge ({id: id}). Fetch ({withelated: [[Posts: work (Q) {quote ('* AS count')}}}}}). Then (function (total) {console.log (total.Tojon (.) Posts [0]. Count);});   
  id .     will give the correct value of the posts under the category identified.

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