set_primary_key error in Rails
primary-key, ruby-on-rails
Solution
If you're using rails 3.2 or higher, the `set_primary_key` method was depreciated, check out the Rails 3.2 release notes - Section 8.1 and it suggests using an assignment method instead like `self.primary_key=`, just like you said you did in your comment
Problem
I'm creating a table called `Index`. Here's the migration: ``` class CreateIndices < ActiveRecord::Migration def change create_table :indices, {:id => false} do |t| t.string :name t.float :returns, array: true, default: [] t.float :navs, array: true, default: [] t.float :sharpe t.timestamps end execute "ALTER TABLE indices ADD PRIMARY KEY (name);" end end ``` That all works fine. I saw in another Stack Overflow question that I have to include the `set_primary_key` command in my model to get it to work, so I have the following in the index.rb ``` class Index < ActiveRecord::Base set_primary_key :name end ``` Besides these two files, I haven't changed anything from the default Rails scaffolding (the app was created with Postgres as the default database). When I go to `localhost:3000/indices`, I get the following error ``` undefined method `set_primary_key' for #<Class:0x37132e0> ``` If I comment out the `set_primary_key` line it loads the regular empty scaffold, but I assume this does not give me the primary key functionality that I want. What am I doing wrong?