Ruby On Rails模型没有方法

Question

I have a model with a belongs to relationship.

class Product < ActiveRecord::Base
  attr_accessible :name, :price, :request_id, :url

  # Relationships
  belongs_to :request

end

class Request < ActiveRecord::Base
  attr_accessible :category, :keyword

  # Relationships
  has_many :products

end

This is the code in my controller function product = Product.where({ :asin => asin }).first

     # See if the product exists
     begin
         #This throws a method not found error for where
        product = Product.where({ :name => name }).first

     rescue 
        Product.new
             # This throws a method not found error for request_id
        product.request_id = request.id
        product.save
     end

I'm trying to create a new product object like so product = Product.first(:conditions => { :name => name })

When I call that I get an error saying undefined method 'first' for Product:Class I tried doing Product.new and I can't access any attributes. I get this for every one undefined method 'request_id=' for #<Product:0x007ffce89aa7f8>

I've been able to save request objects. What am I doing wrong with products?

EDIT:

So as it turns out there was an old Product data type that was being imported that wasn't an ActiveRecord class. It was using that instead of my Product::ActiveRecord. I deleted that import and it's good to go. Sorry to have wasted everybody's time.

Not sure what the proper protocol is here for what to do with this question.

Answer 1

Is your Product class an ActiveRecord::Base class? You can find out by running:

Product.ancestors.include?(ActiveRecord::Base)

If this returns false, it's getting the class loaded from somewhere else.

Answer 2

First check to see that your Product class is set up correctly by typing in:

rails c
# after console has loaded
Product

If this looks correct then we will try to instantiate a product by calling:

# Create a new product
product = Product.new(name: "first product", price: 100, url: "http://www.example.com")
# Persist this object to the database
product.save

If you are missing any attributes run another migration to add them to the Product table.

If none of those suggestions work, check to make sure that there isn't an existing class with the same name in your project. This would cause all kinds of errors and would explain certain methods not being found.