PostgreSQL "Database does not exist" but it does - database

Question

I have been trying to create a database in PostgreSQL for several days and have run into several issues but seem to be stuck.
I have manually created a database in PostgreSQL called postgres_development because bundle exec rake db:create wasn't working.
Now, I am trying to run bundle exec rake db:migrate but it is not recognizing that I have a database called postgres_development.
This is my Rakefile.
require 'rake'
require 'rspec/core/rake_task'
require 'active_support'
require 'active_support/core_ext'
require_relative 'config'
namespace :db do
desc "Drop, create, and migrate the database"
task :reset => [:drop, :create, :migrate]
desc "Create #{APP_NAME} databases"
task "create" do
puts "Creating #{APP_NAME} development and test databases if they don't exist..."
system("#SET PGPASSWORD=#{DB_PASSWORD}; createdb --username=#{DB_USERNAME} --password=#{DB_PASSWORD} #{DB_NAME} && #SET PGPASSWORD=#{DB_PASSWORD}; createdb --username=#{DB_USERNAME} --password=#{DB_PASSWORD} #{TEST_DB_NAME}")
end
desc "Drop #{APP_NAME} databases"
task "drop" do
puts "Dropping #{APP_NAME} development and test databases..."
system("dropdb #{DB_NAME} && dropdb #{TEST_DB_NAME}_test")
end
desc "Migrate the database"
task "migrate" do
ActiveRecord::Migrator.migrations_paths << File.dirname(__FILE__) + 'db/migrate'
ActiveRecord::Migration.verbose = true
ActiveRecord::MigrationContext.new("/db/migrate/").migrate
end
desc "Populate the database with sample data"
task "seed" do
require APP_ROOT.join('db', 'seeds.rb')
end
end
namespace :generate do
desc "Create a database migration\n rake generate:migration NAME=create_people"
task :migration do
unless ENV.has_key?('NAME')
raise "Must specify NAME for migration, e.g. rake generate:migration NAME=create_people"
end
migration_name = ENV['NAME']
class_name = migration_name.camelize
timestamp = Time.now.strftime('%Y%m%d%H%M%S')
filename = "#{timestamp}_#{migration_name}.rb"
path = APP_ROOT.join('db', 'migrate', filename)
if File.exist?(path)
raise "ERROR! File '#{path}' already exists"
end
puts "Creating migration at #{path}"
File.open(path, 'w+') do |f|
f.write("class #{class_name} < ActiveRecord::Migration\n\tdef change\n\n\tend\nend")
end
end
end
desc 'Start IRB with application environment loaded'
task "console" do
exec "irb -r./config"
end
desc "Run the specs"
RSpec::Core::RakeTask.new(:spec)
task :default => :specs
# Will this not work?
#desc "Run the specs"
#task 'specs' do
# exec "rspec spec"
#end
And this is my config.rb in the same folder, postgres which I renamed from activerecord-template in a failed attempt to get it to connect to my database.
require 'pathname'
require 'pg'
require 'active_record'
require 'logger'
## Load all files and configure the db
APP_ROOT = Pathname.new(File.expand_path(File.dirname(__FILE__)))
APP_NAME = APP_ROOT.basename.to_s
DB_PATH = APP_ROOT.join('db', APP_NAME + "_development.db").to_s
DB_NAME = APP_NAME + "_development.db"
TEST_DB_NAME = APP_NAME + "_test.db"
DB_USERNAME = 'postgres'
DB_PASSWORD = '****'
if ENV['DEBUG']
ActiveRecord::Base.logger = Logger.new(STDOUT)
end
Dir[APP_ROOT.join('models', '*.rb')].each do |model_file|
filename = File.basename(model_file).gsub('.rb', '')
autoload ActiveSupport::Inflector.camelize(filename), model_file
end
ActiveRecord::Base.establish_connection :adapter => 'postgresql',
:database => DB_NAME,
:host => 'localhost',
:username => DB_USERNAME,
:password => DB_PASSWORD
Any thoughts on what is going on here would be greatly appreciated!

Answer 1

That seems obvious: You created a database postgres_development, then you try to connect to a database with a different name, namely postgres_development.db.
How is that supposed to work?

Answer 2

in your Rakefile in line 28, add a . in front of the /, i.e. changing it to ActiveRecord::MigrationContext.new("./db/migrate/").migrate
db/migrate/20181108113458_create_people.rb add a [4.2] at the end of the first line ie. changing it to class CreatePeople < ActiveRecord::Migration[4.2]