从Rails模型访问数据库

Question

I'm writing a Rails application and I created a Grocery model that references a database table of grocery items. The Grocery table has just one column named "item".

The Grocery model has a LIST constant that contains a bunch of "item"s. I seed the database with these items initially with the seeds.rb file. I also created a rake task to add/remove groceries from the database. The database is successfully populated.

The problem: I want to check the Grocery table within the Grocery model and other models to see whether or not a certain item is in the database. Every time I do a pry and access the Grocery table from within the Grocery model, I can't see any db items. (However, I can see the db items when I do a Grocery.all from the console and in rake tasks.)

I've added attr_accessor :item to the Grocery model. This still does not work. What am I missing?

Answer 1

If you have not added any default scope to the Grocery model, you should be able to fetch all the groceries inside Grocery or other models by using Grocery.all . If you want to find if a certain grocery item exists in the grocery table, you can use Grocery.exists?(grocery_item_id) . I hope it helps, if it doesn't, would recommend you to paste your model code here in the question.