CODEWITHSUNDEEP
datetimeruby-on-rails-4
camdixon
camdixon

Reputation: 892

How to use Rails' DateTime class to add minutes and seconds

I have a variable called @start_time and @end_time that is a DateTime object in Rails:

@start_time = params[:start_time]
@end_time = @start_time + 30.minutes

In my controller I get the error:

undefined method '+' for nil:NilClass

I read "Time manipulation in ruby" that said I could add 30.minutes to a DateTime class object.

My @start_time is set by the user in a view called "new". I also confirmed that @start_time has the correct values and is passing them into the controller.

My problem is adding 30 minutes to it.

<div class="form-group">
      <%= f.label 'Lesson Start' %>
      <%= f.datetime_select :start_time, class: "form-control", ampm: true %>
</div>

When I debug the incoming POST information it gives me this:

(byebug) params                                                                                                                                                           
{"utf8"=>"✓", "authenticity_token"=>"3ZUkfyga9SxuZqSWo8RWAIcRPHvYisQUxapgXt4Zx8E=", "lesson"=>{"user_id"=>"1", "student_id"=>"1", "start_time(1i)"=>"2014", "start_time(2i
)"=>"8", "start_time(3i)"=>"7", "start_time(4i)"=>"10", "start_time(5i)"=>"10"}, "lesson_length"=>"45", "commit"=>"Schedule Lesson", "action"=>"create", "controller"=>"le
ssons"}

I tried my parameters in my controller like this:

def create
    @lesson = Lesson.new(lesson_params)
    @current_date = params[:date] || Date.today
    @start_time = params[:start_time]
    @end_time = @start_time + 30.minutes
end

def lesson_params
    params.require(:lesson).permit!
end

Upvotes: 1

Views: 2705

Answers (1)

SteveTurczyn
SteveTurczyn

Reputation: 36880

You are not assigning the form data to an instance variable.

In your new method you need to do that explicitly

def create
  @start_time = params[:start_time]
  ...
end

Upvotes: 1

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