ruby 1.9.2 does not support pg gem? cant heroku rake db:migrate (

i am using ruby 1.9.2 and rails 3.1.0 please help, cause i very need it to work for studying. It's my university project(

i have installed this gems

gem 'thin'
gem 'pg'

but when i use heroku rake db:migrate is tells me to instal postgreadapter. But i have it.

I did all that i read about this problem, als开发者_如何转开发o did

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

in rubymine it writes gem "pg" is not available in SDK 'ruby-1.9.2-p290'

same with thin and heroku gems

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It seems you have not installed those gems in rubymine (locally). run "bundle install" or if you need to do something specific in rubymine to install gems.