ActiveRecord::StatementInvalid - SQLite3::SQLException: no such column - ruby-on-rails

Question

When running my tests in RSpec, I get these errors:
Failures:
1) User micropost associations should have the right micropost in the right order
←[31mFailure/Error:←[0m ←[31m#user.microposts.should == [newer_micropost, older_micropost]←[0m
←[31mActiveRecord::StatementInvalid:←[0m
←[31mSQLite3::SQLException: no such column: micropost.created_at: SELECT "microposts".* FROM "microposts" WHERE "microposts"."user_id" = 1 ORD
ER BY micropost.created_at DESC←[0m
←[36m # C:in `load_target'←[0m
←[36m # ./spec/models/user_spec.rb:153:in `block (3 levels) in <top (required)>'←[0m
2) User micropost associations should destroy associated microposts
←[31mFailure/Error:←[0m ←[31mmicroposts = #user.microposts.dup←[0m
←[31mActiveRecord::StatementInvalid:←[0m
←[31mSQLite3::SQLException: no such column: micropost.created_at: SELECT "microposts".* FROM "microposts" WHERE "microposts"."user_id" = 1 ORD
ER BY micropost.created_at DESC←[0m
←[36m # C:in `load_target'←[0m
←[36m # ./spec/models/user_spec.rb:157:in `block (3 levels) in <top (required)>'←[0m
Finished in 5.18 seconds
←[31m97 examples, 2 failures←[0m
user_spec.rb:
require 'spec_helper'
describe User do
before do
#user = User.new(name: "John Smith", email: "john#example.com",
password: "password", password_confirmation: "password")
end
subject { #user }
it { should respond_to(:name) }
it { should respond_to(:email) }
it { should respond_to(:password_digest) }
it { should respond_to(:password) }
it { should respond_to(:password_confirmation) }
it { should respond_to(:remember_token) }
it { should respond_to(:admin) }
it { should respond_to(:authenticate) }
it { should respond_to(:microposts) }
it { should be_valid }
it { should_not be_admin }
describe "micropost associations" do
before { #user.save }
let!(:older_micropost) do
FactoryGirl.create(:micropost, user: #user, created_at: 1.day.ago)
end
let!(:newer_micropost) do
FactoryGirl.create(:micropost, user: #user, created_at: 1.hour.ago)
end
it "should have the right micropost in the right order" do
# user.micropost returns an array
#user.microposts.should == [newer_micropost, older_micropost]
end
it "should destroy associated microposts" do
microposts = #user.microposts.dup
#user.destroy
microposts.should_not be_empty
microposts.each do |micropost|
Micropost.find_by_id(micropost.id).should be_nil
end
end
end
end
schema.rb (shortened):
ActiveRecord::Schema.define(:version => 20131002154740) do
create_table "microposts", :force => true do |t|
t.string "content"
t.integer "user_id"
t.datetime "created_at", :null => false
t.datetime "updated_at", :null => false
end
add_index "microposts", ["user_id", "created_at"], :name => "index_microposts_on_user_id_and_created_at"
create_table "users", :force => true do |t|
.
.
.
.
end
end
Micropost model:
class Micropost < ActiveRecord::Base
attr_accessible :content
belongs_to :user
validates :user_id, presence: true
# Ensures the microposts are in descending (DESC) order
# from newest to oldest, (SQL syntax).
default_scope order: 'micropost.created_at DESC'
end
I have run bundle exec rake db:migrate along with bundle exec rake db:test:prepare, I have also reset the database and tried it again but this didn't work.
Specifically the error reads: SQLite3::SQLException: no such column: micropost.created_at: SELECT "microposts".* FROM "microposts" WHERE "microposts"."user_id" = 1 ORD
ER BY micropost.created_at DESC

Answer 1

Well, the SQL problem is that the table name on your sort column is singular rather than plural.
i.e. "ORDER BY micropost.created_at" should read "ORDER BY microposts.created_at".
If you also post your Micropost and User model source code, I might be able to tell if this is caused by a bug in your model code or a bug in ActiveRecord.
Which version of Rails are you using?