Question

I have a model:

class HelloRails < ActiveRecord::Base
  attr_accessible :filename, :filevalidate
  include In4systemsModelCommon

  validates :filename, presence: true

  def update
      parameters = [self.filename, @current_user]
      parameters.map!{|p| ActiveRecord::Base.connection.quote p}
      sql = "call stored_procedure(#{parameters.join(',')})"
      ActiveRecord::Base.connection.execute(sql)
  end
end

In the view I have a text_field called as :filename. When I click the submit button it calls this update method in model to call the stored proc to execute. Now validations are not working.

I dont want to accept nil for filename. How can I do this?

Answer 1

It doesn’t validate because you are executing sql directly:

ActiveRecord::Base.connection.execute(sql)

Validations are only run when you use the “normal” ActiveRecord methods like save and update_attributes. To run validations manually you can call valid? on your object.

Model:

def update
  return false unless self.valid? # validation failed: return false
  parameters = [self.filename, @current_user]
  parameters.map!{|p| ActiveRecord::Base.connection.quote p}
  sql = "call stored_procedure(#{parameters.join(',')})"
  ActiveRecord::Base.connection.execute(sql)
  true
end

Then in your controller you have to check wether @object.update returns true or false and display errors in your view if necessary.

Controller:

# This is just an example. I don't know your code.
def update
  @object = HelloRails.find(params[:id])

  if @object.update
    redirect_to somewhere
  else
    render :action => 'edit'
  end
end