ruby on rails - Rails4 Strong parameters without database column -

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I have problems with public assignment and strong parameters In my model I have many properties, which in my mysql database Are displayed through a column. I have a field too, it is not so. I need this to calculate the price I do not want to store it in my database.

I have defined strong parameters in my controller: 

  def timeslots_params params.require (: timeslot) .permit (: Employee_id ,: dienstplan_id ,: start_date ,: Start_time)

But when I'm trying to use the start_time feature in my controller, I 

  Start_time for #define method # Times: Lot 0x007fff2d5d8070> Error.

There are other defined parameters with DB columns and filled with values. Do not I remember the strong parameters and I have to define something else?

Edit: Here's the code, where I call Times Lightsparam: 

  def create @e = Timeslot New (Times Lotus_Peram) @ E. Start_date = @E Start_date To_s + "" + @ e. Start_time TOS If @ e.save current_user.timeslots & lt; & Lt; Do not reply @ E. Format | Format.json {Render: Jason = & gt; @E} End And End  
 "post-text" itemprop = "text"> 
 Please only allow the parameter, which you expect to send to your user if with data Start_time does not have user data to update your db, so use it like this: 
 
  parameter.way ... (.  
 if you use : Start_time, it should be defined in your model.  
  P> Oops, I have seen your update:  
  @ e.start_date = @ e. Start_date.to_s + "+ @ e.start_time.to_s  
 
 If you send: start_time to start with TimesSlot example, then start_time should be a method of Times Lot Model defined by rail.If it is DB area, defined with attr_accesor or att_reader Or your source model is defined by def key. 
 
 If not  @ e.start_time  triggers  undefined method 'start_time' . 
 
 Re-edited: 
 
 Now, start_time is a model variable. Make sure that the form is sent in the same way that you do with the field. By default, we have an F  and lt;% = f.text_field: the_field% & gt; . Just do not forget F. 
 
 If you follow my first advice then you will have to give permission for this area again.

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