Ruby on Rails - model validation

Question

I have a problem with simple model validation. Entering materials without SKU is getting me error message:

NoMethodError in Materials#create undefined method `empty?' for 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 do |format|
      if @material.save
        format.html { redirect_to @material, notice: 'Material was successfully 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

Marek Lipka · Accepted Answer · 2015-04-23 06:53:22Z

3

Your @units instance variable is nil in create action. You should set it the same way as you do in new or edit actions after your records fails validation.

answered Apr 23, 2015 at 6:53

Marek Lipka

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1 Comment

Robert Over a year ago

I was missing @categories and @units. Thank you.

jon snow · Accepted Answer · 2015-04-23 06:53:49Z

1

Define @units also in your create method

answered Apr 23, 2015 at 6:53

jon snow

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