I have a simple sinatra-activerecord app. Inside the file ./config/environments.rb I have the following

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Asked: June 12, 20262026-06-12T04:03:09+00:00 2026-06-12T04:03:09+00:00

I have a simple sinatra-activerecord app. Inside the file ./config/environments.rb I have the following

0

I have a simple sinatra-activerecord app. Inside the file ./config/environments.rb I have the following configurations:

configure :development, :test do
  set :database, 'sqlite://database.db'
end

# These Heroku setup instructions can be at: https://devcenter.heroku.com/articles/rack
configure :production do
  # Database connection
  db = URI.parse(ENV['DATABASE_URL'] || 'postgres://localhost/mydb')

  ActiveRecord::Base.establish_connection(
    :adapter  => db.scheme == 'postgres' ? 'postgresql' : db.scheme,
    :host     => db.host,
    :username => db.user,
    :password => db.password,
    :database => db.path[1..-1],
    :encoding => 'utf8'
  )
end

When I push to Heroku, the DB setup works just fine. However, locally, it doesn’t. For example, if I do

$ rake db:migrate

I get the following fine output:

==  CreateHotels: migrating ===================================================
-- create_table(:hotels)
   -> 0.0015s
-- add_index(:hotels, :hotel_name)
   -> 0.0004s
==  CreateHotels: migrated (0.0021s) ==========================================

Now, if I start the server and use curl to make a call:

$ shotgun app.rb
$ curl -d "hotel_name=Sheraton" http://127.0.0.1:9393/hotels/

I get the following error:

ActiveRecord::StatementInvalid - Could not find table 'hotels':
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/connection_adapters/sqlite_adapter.rb:472:in `table_structure'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/connection_adapters/sqlite_adapter.rb:346:in `columns'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/connection_adapters/schema_cache.rb:12:in `block in initialize'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/model_schema.rb:228:in `yield'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/model_schema.rb:228:in `default'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/model_schema.rb:228:in `columns'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/model_schema.rb:243:in `column_defaults'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/activerecord-3.2.8/lib/active_record/base.rb:482:in `initialize'
    /Users/Sy/Developer/Sinatra/stay-checkin-api/routes/hotels_routes.rb:8:in `new'
    /Users/Sy/Developer/Sinatra/stay-checkin-api/routes/hotels_routes.rb:8:in `block in <top (required)>'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `each'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:755:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-protection-1.2.0/lib/rack/protection/path_traversal.rb:16:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-protection-1.2.0/lib/rack/protection/json_csrf.rb:17:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-protection-1.2.0/lib/rack/protection/base.rb:47:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/nulllogger.rb:9:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/head.rb:9:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/showexceptions.rb:21:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:99:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `block in call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:1471:in `synchronize'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/lint.rb:48:in `_call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/lint.rb:36:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/showexceptions.rb:24:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/commonlogger.rb:20:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/sinatra-1.3.3/lib/sinatra/base.rb:136:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:86:in `proceed_as_child'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:31:in `call!'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/loader.rb:18:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/lib/shotgun/favicon.rb:12:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:134:in `call'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/connection.rb:80:in `block in pre_process'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/connection.rb:78:in `catch'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/connection.rb:78:in `pre_process'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/connection.rb:53:in `process'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/connection.rb:38:in `receive_data'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in `run_machine'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in `run'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/backends/base.rb:63:in `start'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/thin-1.4.1/lib/thin/server.rb:159:in `start'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/handler/thin.rb:13:in `run'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/gems/shotgun-0.9/bin/shotgun:156:in `<top (required)>'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/bin/shotgun:19:in `load'
    /Users/Sy/.rvm/gems/ruby-1.9.3-p125/bin/shotgun:19:in `<main>'

Any idea?

ps: here are my app.rb, config.rb, routes, and model file.

app.rb

require 'sinatra'
require 'sinatra/activerecord'
require 'uri'
require './config/environments'


require_relative 'models/init'
require_relative 'routes/init'

config.rb

require './app'
run Sinatra::Application

model: hotel.rb

class Hotel < ActiveRecord::Base
  validates :hotel_name, :presence => true    
end

routes: hotels_routes.rb

get '/hotels' do
  @hotels = Hotel.all
  if @hotels
      content_type :json
      @hotels.to_json
  end
end


post '/hotels/' do
  @hotel = Hotel.new
  @hotel.hotel_name = params[:hotel_name]
  if @hotel.save 
    content_type :json
    @hotel.to_json
  else
    content_type :json
    "Failed to create new hotel with name #{params[:hotel_name]}".to_json
  end
end

Gemfile

source :rubygems

gem 'heroku'
gem 'sinatra'
gem 'thin'
gem 'activerecord'
gem 'sinatra-activerecord'
gem 'json'

# Define which database gem to use depending on whether you are in local or production environment

group :development, :test do
  gem 'sqlite3'
end

group :production do
  gem 'pg' # this gem is required to use postgres on Heroku
end

Rakefile

require './app'
require 'sinatra/activerecord/rake'

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1 Answer

Editorial Team · Answer 1 · 2026-06-12T04:03:11+00:00

Editorial Team

2026-06-12T04:03:11+00:00Added an answer on June 12, 2026 at 4:03 am

The database set is wrong, try:

set :database, 'sqlite:///database.db'

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