javascript - foreach loop with link to 'this' in CoffeeScript -

there following code:

  user.prototype.convertfrompermissionstoscopes = ->     this.scopes = {}     scopesnames = ['create', 'delete', 'update', 'show']     groupname of this.permissions       this.scopes[groupname] = {}       scopesnames.foreach (scopename) ->         this.scopes[groupname][scopename] = this.permissions[groupname].indexof(scopename) isnt -1 

i got error 'this.scopes undefined' @ last line. how can fix it? thanks!

use fat arrow pass outer this context of foreach:

scopesnames.foreach (scopename) => 

that ensure outer scope passed context of method.

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just sidenote can use :: prototype , @ this:

user::convertfrompermissionstoscopes = ->   @scopes = {}   scopesnames = ['create', 'delete', 'update', 'show']   groupname of @permissions     @scopes[groupname] = {}     scopesnames.foreach (scopename) =>       @scopes[groupname][scopename] = @permissions[groupname].indexof(scopename) isnt -1