ruby on rails - How do you use map to get a hash instead of an array? -


I am currently using the following to get an array of certain fields in a table: 

  classes.all.map (and: teacher_name)   
 This gives it:  
  ["James", "Josh" , "Peter"   
 I wish there is something in return for a hash, where I can include teacher_ID:  
  {"James "= & Gt; "1", "Josh" => "2", "Peter" => "3"}   
 I tried to use the classrooms.all.map (& amp;: teacher_name, & amp;: teacher_id)  Syntax error is returned.  
 Thank you!   
 
 
 Do it in a new way:  
  pairs = Classrooms.all .map {| T | [T. TeacherName, T. Teacher_ID] # [key, value]} hash = hash [couple] #in / old / ruby: hash [* pairs.flatten]   
 .. or whatnot  
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