Ruby on Rails - model validation -


i have problem simple model validation. entering materials without sku getting me error message:

nomethoderror in materials#create undefined method `empty?' nil:nilclass

enter image description here material.rb:

class material < activerecord::base   validates :sku, :presence => true end

materials_controler.rb (create part only):

# post /materials   # post /materials.json   def create     @material = material.new(material_params)       respond_to |format|       if @material.save         format.html { redirect_to @material, notice: 'material created.' }         format.json { render :show, status: :created, location: @material }       else         format.html { render :new }         format.json { render json: @material.errors, status: :unprocessable_entity }       end     end   end

define @units in create method


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