I am working on a Sinatra application where I would like to use data_mapper & sqlite3.
in app.rb I have:
require 'sinatra'
require 'data_mapper'
in the console when I do $ gem list I get(list somewhat edited to reflect db gems:
* LOCAL GEMS *
activemodel (4.0.2)
activerecord (4.0.2)
activerecord-deprecated_finders (1.0.3)
activesupport (4.0.2)
addressable (2.3.5)
arel (4.0.2)
atomic (1.1.14)
bcrypt-ruby (3.1.2)
bigdecimal (1.2.3)
buftok (0.2.0)
builder (3.1.4)
bundler (1.5.3)
bundler-unload (1.0.2)
cookiejar (0.3.0)
daemons (1.1.9)
data_mapper (1.2.0)
data_objects (0.10.13)
descendants_tracker (0.0.3)
dm-aggregates (1.2.0)
dm-constraints (1.2.0)
dm-core (1.2.1)
dm-do-adapter (1.2.0)
dm-migrations (1.2.0)
dm-serializer (1.2.2)
dm-sqlite-adapter (1.2.0)
dm-timestamps (1.2.0)
dm-transactions (1.2.0)
dm-types (1.2.2)
dm-validations (1.2.0)
do_sqlite3 (0.10.13)
fastercsv (1.5.5)
gem-wrappers (1.2.4)
http (0.5.0)
http_parser.rb (0.6.0)
i18n (0.6.9)
io-console (0.4.2)
json (1.8.1)
json_pure (1.8.1)
memoizable (0.4.0)
mini_portile (0.5.2)
minitest (4.7.5)
multi_json (1.8.4)
multipart-post (2.0.0)
oauth (0.4.7)
pg (0.17.1)
rack (1.5.2)
rack-protection (1.5.2)
rake (10.1.0)
rdoc (4.1.0)
rubygems-bundler (1.4.2)
rvm (1.11.3.8)
shotgun (0.9)
simple_oauth (0.2.0)
sinatra (1.4.4)
sinatra-activerecord (1.3.0)
sqlite3 (1.3.8)
when I go to irb and require data_mapper I get =>"true" However, when I got to the app through a browser I get: LoadError: cannot load such file -- data_mapper. From what I have read this problem is usually a result of require 'datamapper' instead of require 'data_mapper'. What am I doing wrong?
Try requiring dm-sqlite-adapter says the Docster
You've got the gem but not requiring it in code. I don't know if this will fix it but in a recent project the adapter was what we needed to require explicitly in our controller.
Related
First off I'm a Newbie in regards to Ruby, and I'm following the simple tutorial on https://www.distilled.net/resources/web-scraping-with-ruby-and-nokogiri-for-beginners/
I have a test.rb file that contains the following:
require 'rubygems'
require 'Nokogiri'
require 'HTTParty'
require 'Pry'
require 'csv'
# this is how we request the page we're going to scrape
page = HTTParty.get('https://newyork.craigslist.org/search/pet?s=0')
Pry.start(binding)
When I try to run the ruby test script, I get the following error:
pjw#ubuntu:~/ruby/test$ ruby test.rb
/home/pjw/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- HTTParty (LoadError)
from /home/pjw/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from test.rb:1:in `<main>'
I've verified HTTParty works properly by running:
httparty "https://newyork.craigslist.org/search/pet?s=0"
The problem seems to be the require statement. If I mix the order or the required gems, the first one gives the same error as above. I've searched online and can't seem to find what I'm missing...
in `require': cannot load such file -- httparty (LoadError) - (No Answer)
kernel_require.rb:55:in `require': cannot load such file error - (bundle exec ruby test.rb "Could not locate Gemfile or .bundle/ directory")
Unable to run .rb files on mac - getting /.rbenv/versions/2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require' - (GEMS already Installed)
pjw#ubuntu:~/ruby/test$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial
pjw#ubuntu:~/ruby/test$ ruby -v
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
pjw#ubuntu:~/ruby/test$ gem list
*** LOCAL GEMS ***
actioncable (5.0.0.1)
actionmailer (5.0.0.1)
actionpack (5.0.0.1)
actionview (5.0.0.1)
activejob (5.0.0.1)
activemodel (5.0.0.1)
activerecord (5.0.0.1)
activesupport (5.0.0.1)
addressable (2.5.0)
arel (7.1.4)
autoprefixer-rails (6.5.3, 6.5.2, 6.5.1)
bcrypt (3.1.11)
bigdecimal (default: 1.2.8)
bootstrap (4.0.0.alpha5)
bootstrap-datepicker-rails (1.6.4.1)
bootstrap-sass (3.3.7)
builder (3.2.2)
bundler (1.13.6)
bundler-unload (1.0.2)
byebug (9.0.6)
cancancan (1.15.0)
coderay (1.1.1)
coffee-rails (4.2.1)
coffee-script (2.4.1)
coffee-script-source (1.10.0)
commonjs (0.2.7)
concurrent-ruby (1.0.2)
connection_pool (2.2.1, 2.2.0)
dashing-rails (2.5.0)
debug_inspector (0.0.2)
devise (4.2.0)
did_you_mean (1.0.2, 1.0.0)
erubis (2.7.0)
execjs (2.7.0)
executable-hooks (1.3.2)
ffi (1.9.14)
figaro (1.1.1)
gem-wrappers (1.2.7)
geocoder (1.4.0)
globalid (0.3.7)
gravatarify (3.1.1)
httparty (0.14.0)
i18n (0.7.0)
io-console (0.4.6, default: 0.4.5)
jbuilder (2.6.0)
jquery-rails (4.2.1)
json (2.0.2, default: 1.8.3)
less (2.6.0)
less-rails (2.8.0)
listen (3.1.5, 3.0.8)
loofah (2.0.3)
mail (2.6.4)
method_source (0.8.2)
mime-types (3.1)
mime-types-data (3.2016.0521)
mini_portile2 (2.1.0)
minitest (5.9.1, 5.8.3)
multi_json (1.12.1)
multi_xml (0.5.5)
net-telnet (0.1.1)
nio4r (1.2.1)
nokogiri (1.6.8.1)
orm_adapter (0.5.0)
power_assert (0.3.1, 0.2.6)
pry (0.10.4)
psych (2.1.1, default: 2.0.17)
public_activity (1.5.0)
public_suffix (2.0.4)
puma (3.6.0)
rack (2.0.1)
rack-test (0.6.3)
rails (5.0.0.1)
rails-dom-testing (2.0.1)
rails-html-sanitizer (1.0.3)
rails_serve_static_assets (0.0.5)
rails_stdout_logging (0.0.5)
railties (5.0.0.1)
rake (11.3.0, 10.4.2)
rb-fsevent (0.9.8)
rb-inotify (0.9.7)
rdoc (5.0.0, default: 4.2.1)
redis (3.3.1)
responders (2.3.0)
ruby_dep (1.5.0)
rubygems-bundler (1.4.4)
rubygems-update (2.6.8)
rufus-scheduler (3.2.2)
rvm (1.11.3.9)
sass (3.4.22)
sass-rails (5.0.6)
simple_calendar (2.2.0)
simple_form (3.3.1)
slop (4.4.1, 3.6.0)
spring (2.0.0)
spring-watcher-listen (2.0.1)
sprockets (3.7.0)
sprockets-rails (3.2.0)
sqlite3 (1.3.12)
table_print (1.5.6)
test-unit (3.2.2, 3.1.5)
thor (0.19.1)
thread_safe (0.3.5)
tilt (2.0.5)
turbolinks (5.0.1)
turbolinks-source (5.0.0)
twitter-bootstrap-rails (3.2.2)
tzinfo (1.2.2)
uglifier (3.0.3, 3.0.2)
warden (1.2.6)
web-console (3.4.0, 3.3.1)
websocket-driver (0.6.4)
websocket-extensions (0.1.2)
wunderground (1.2.0)
Try simply this. It's all downcase
require 'httparty'
ubuntu#ip-172-31-19-199:~/ruby$ sudo apt install ruby-httparty
Install ruby-httparty and you won't get the error.
I work on JetBrains RubyMine 5.4.3.2.1 with Ruby193. I used to debug all the time until rubymine popped up an update for ruby-debug and I clicked yes. Ever since that update I tried to reinstall previous versions and I get this error:
Failed to Install Gems. Following gems were not installed:
C:\Program Files (x86)\JetBrains\RubyMine 5.4.2\rb\gems\ruby-debug-base19x-0.11.30.pre12.gem:
Error installing ruby-debug-base19x-0.11.30.pre12.gem:
ERROR: Failed to build gem native extension. C:/Ruby193/bin/ruby.exe extconf.rb C:/Ruby193/bin/ruby.exe: No such file or directory -- extconf.rb (LoadError)
Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/ruby-debug-base19x-0.11.30.pre12 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/ruby-debug-base19x-0.11.30.pre12/ext/ruby_debug/gem_make.out
Obviously I do have the Devkit installed properly because it did work until now (tried reinstalling ruby and devkit again but no luck).
How can I fix this?
Both gems; ruby-debug and debugger; mess up debugging through RubyMine. Also, I had to manually install a version of linecache (0.5.13) to get the IDE debugging to work. Here is my gem list.
actionmailer (4.0.0, 3.2.13)
actionpack (4.0.0, 3.2.13)
activeadmin (0.6.0)
activemodel (4.0.0, 3.2.13)
activerecord (4.0.0, 3.2.13)
activerecord-deprecated_finders (1.0.3)
activerecord-import (0.4.1)
activerecord-postgresql-adapter (0.0.1)
activeresource (3.2.13)
activesupport (4.0.0, 3.2.13)
arbre (1.0.1)
archive-tar-minitar (0.5.2)
arel (4.0.0, 3.0.2)
atomic (1.1.10)
backbone-relational-rails (0.8.5, 0.7.1)
bcrypt-ruby (3.0.1)
bigdecimal (1.1.0)
bourbon (3.1.8)
builder (3.1.4, 3.0.4)
bundler (1.3.5)
childprocess (0.3.9)
climate_control (0.0.3)
cocaine (0.5.1)
coffee-rails (3.2.2)
coffee-script (2.2.0)
coffee-script-source (1.6.2)
columnize (0.3.6)
commander (4.1.3)
curb (0.8.4)
curl-multi (0.2)
daemon_controller (1.1.4)
debugger-linecache (1.2.0)
debugger-ruby_core_source (1.2.3)
devise (2.2.4)
diff-lcs (1.2.4)
eco (1.0.0)
eco-source (1.1.0.rc.1)
ejs (1.1.1)
erubis (2.7.0)
execjs (1.4.0)
fastercsv (1.5.5)
fastthread (1.0.7)
ffi (1.9.0)
foreigner (1.4.2)
formtastic (2.2.1)
has_scope (0.5.1)
highline (1.6.19)
hike (1.2.3)
httpclient (2.3.3)
i18n (0.6.4, 0.6.1)
inherited_resources (1.4.0)
io-console (0.3)
jasmine (1.3.2)
jasmine-core (1.3.1)
journey (1.0.4)
jquery-rails (2.1.4)
json (1.8.0)
kaminari (0.14.1)
linecache19 (0.5.13)
mail (2.5.4)
meta_search (1.1.3)
mime-types (1.23)
mini_portile (0.5.0)
minitest (4.7.5, 2.5.1)
modernizr (2.6.2)
modernizr-rails (2.6.2.3)
multi_json (1.7.7)
mysql2 (0.3.11)
net-ssh (2.6.8)
nokogiri (1.6.0)
open4 (1.3.0)
orm_adapter (0.4.0)
paperclip (3.4.2)
passenger (4.0.5)
pg (0.15.1)
polyamorous (0.5.0)
polyglot (0.3.3)
pr_geohash (1.0.0)
rack (1.5.2, 1.4.5)
rack-cache (1.2)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.13)
rails-backbone (0.9.10)
rails-footnotes (3.7.9)
railties (4.0.0, 3.2.13)
rake (10.0.4, 0.9.2.2)
rdoc (3.12.2, 3.9.5)
responders (0.9.3)
rhc (1.10.7)
rsolr (1.0.9)
rspec (2.13.0)
rspec-core (2.13.1)
rspec-expectations (2.13.0)
rspec-mocks (2.13.1)
rspec-rails (2.13.2)
ruby-debug-base19 (0.11.26)
ruby-debug-base19x (0.11.30.pre12)
ruby-debug-ide (0.4.17.beta17)
ruby-debug19 (0.11.6)
ruby_core_source (0.1.5)
rubygems-update (2.0.3)
RubyInline (3.12.2)
rubyzip (0.9.9)
sass (3.2.9)
sass-rails (3.2.6)
selenium-webdriver (2.33.0)
spork (0.9.2)
sprockets (2.10.0, 2.2.2)
sprockets-rails (2.0.0)
sunspot (2.0.0)
sunspot_rails (2.0.0)
sunspot_solr (2.0.0)
thor (0.18.1)
thread_safe (0.1.0)
tilt (1.4.1)
treetop (1.4.14)
tzinfo (0.3.37)
uglifier (2.1.1)
underscore-rails (1.4.4)
warden (1.2.1)
websocket (1.0.7)
ZenTest (4.9.2)
zurb-foundation (4.2.2)
I had just upgrade from Ruby192 to Ruby193 (rubyinstaller-1.9.3-p392).
After gone through many errors and googling, I manage to start up the server normally without any error.
When I start up my server with debug mode (In NetBeans 6.9.1) it just ignore the breakpoints and continue to load the page, see below output.
Fast Debugger (ruby-debug-ide 0.4.17.beta16, ruby-debug-base19x 0.11) listens on 127.0.0.1:49628
=> Booting WEBrick
=> Rails 3.2.12 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2013-03-09 11:34:54] INFO WEBrick 1.3.1
[2013-03-09 11:34:54] INFO ruby 1.9.3 (2013-02-22) [i386-mingw32]
[2013-03-09 11:34:54] INFO WEBrick::HTTPServer#start: pid=708 port=3000
Breakpoint 32 at D:/MyWorkspace/NetBeans_Projects/homeloqsg/app/controllers/miscellaneous_controller.rb:7
I have the following gem installed
$ gem list
*** LOCAL GEMS ***
actionmailer (3.2.12)
actionpack (3.2.12)
activemodel (3.2.12)
activerecord (3.2.12)
activeresource (3.2.12)
activesupport (3.2.12)
addressable (2.3.3)
archive-tar-minitar (0.5.2)
arel (3.0.2)
authlogic (3.2.0)
aws-s3 (0.6.3)
aws-sdk (1.8.3.1)
bigdecimal (1.1.0)
bson (1.8.3)
bson_ext (1.8.3)
builder (3.0.4)
bundler (1.3.1)
carrierwave (0.8.0)
climate_control (0.0.3)
cocaine (0.5.1)
columnize (0.3.6)
debugger (1.4.0)
debugger-linecache (1.1.2)
debugger-ruby_core_source (1.2.0)
erubis (2.7.0)
excon (0.16.10)
fog (1.10.0)
formatador (0.2.4)
gmaps4rails (1.5.6)
heroku (2.35.0)
heroku-api (0.3.8)
hike (1.2.1)
i18n (0.6.4)
io-console (0.3)
journey (1.0.4)
jquery-rails (2.2.1)
json (1.5.5)
launchy (2.2.0)
linecache19 (0.5.12)
mail (2.4.4)
mime-types (1.21)
minitest (2.5.1)
multi_json (1.6.1)
mysql (2.8.1 x86-mingw32)
net-scp (1.1.0)
net-ssh (2.6.6)
netrc (0.7.7)
nokogiri (1.5.6 x86-mingw32)
paperclip (3.4.1)
pg (0.14.1 x86-mingw32)
polyglot (0.3.3)
rack (1.4.5)
rack-cache (1.2)
rack-ssl (1.3.3)
rack-test (0.6.2)
rails (3.2.12)
railties (3.2.12)
rake (0.9.2.2)
rdiscount (1.6.8)
rdoc (3.9.5)
rest-client (1.6.7)
rmagick (2.13.2)
ruby-debug-base19x (0.11.30.pre10)
ruby-debug-ide (0.4.17.beta16)
ruby-hmac (0.4.0)
ruby_core_source (0.1.5)
rubygems-update (2.0.1)
rubyzip (0.9.9)
sitemap_generator (3.4)
sprockets (2.2.2)
thor (0.17.0)
tilt (1.3.4)
treetop (1.4.12)
tzinfo (0.3.36)
uuidtools (2.1.3)
will_paginate (3.0.4)
xml-simple (1.1.2)
After struggled for hours I manage to solved this issue.
I think I have too many debug gems.
debugger (1.4.0)
debugger-linecache (1.1.2)
debugger-ruby_core_source (1.2.0)
ruby-debug-base19x (0.11.30.pre10)
ruby-debug-ide (0.4.17.beta16)
linecache19 (0.5.12)
After removed the following gems it working fine and the breakpoints just stop at the line I want.
debugger (1.4.0)
debugger-linecache (1.1.2)
debugger-ruby_core_source (1.2.0)
Thanks.
I forked puppet-dashboard to make add some filtering to the reports tab. I was asked to write some specs for my changes, but I'm get the following error when trying to run rake spec
/Users/gposton/src/puppet-dashboard/vendor/rails/activesupport/lib/active_support/test_case.rb:12: warning: already initialized constant Mocha
/Users/gposton/src/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:466:in `load_missing_constant': uninitialized constant Mocha::Standalone (NameError)
from /Users/gposton/src/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:106:in `const_missing'
from /Users/gposton/src/puppet-dashboard/vendor/gems/rspec-1.3.2/lib/spec/adapters/mock_frameworks/mocha.rb:12
from /Users/gposton/.rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
from /Users/gposton/.rvm/rubies/ruby-1.8.7-p358/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
from /Users/gposton/src/puppet-dashboard/vendor/rails/activesupport/lib/active_support/dependencies.rb:184:in `require'
from /Users/gposton/src/puppet-dashboard/vendor/gems/rspec-1.3.2/lib/spec/runner/options.rb:313:in `plugin_mock_framework'
from /Users/gposton/src/puppet-dashboard/vendor/gems/rspec-1.3.2/lib/spec/runner/options.rb:139:in `run_examples'
from /Users/gposton/src/puppet-dashboard/vendor/gems/rspec-1.3.2/lib/spec/runner/command_line.rb:9:in `run'
from /Users/gposton/src/puppet-dashboard/vendor/gems/rspec-1.3.2/bin/spec:5
rake aborted!
Any ideas?
Here is my configuration.
gposton:puppet-dashboard/ (master✗) $ gem list
*** LOCAL GEMS ***
actionpack (3.2.8)
activemodel (3.2.8)
activesupport (3.2.8)
ap (0.1.1)
builder (3.0.0)
bundler (1.1.3)
colorize (0.5.8)
crack (0.3.1)
daemons (1.0.10)
diff-lcs (1.1.3)
domain_name (0.5.3)
erubis (2.7.0)
factory_girl (2.6.4)
ffi (1.0.11, 0.6.3)
haml (3.1.7)
hike (1.2.1)
httparty (0.8.3)
httpclient (2.2.5)
i18n (0.6.0)
journey (1.0.4)
json (1.7.1)
libvirt (0.2.0)
mail (2.4.4)
mechanize (2.4)
metaclass (0.0.1)
mime-types (1.18)
mocha (0.12.3)
mogilefs-client (3.1.1)
multi_json (1.3.4)
multi_xml (0.4.4)
mysql (2.8.1)
net-http-digest_auth (1.2)
net-http-persistent (2.6)
net-scp (1.0.4)
net-ssh (2.3.0)
nokogiri (1.4.7)
ntlm-http (0.1.1)
polyglot (0.3.3)
rack (1.1.2)
rack-cache (1.2)
rack-ssl (1.3.2)
rack-test (0.6.1)
railties (3.2.8)
rake (0.9.2.2)
rdoc (3.12)
rspec (2.11.0)
rspec-core (2.11.1)
rspec-expectations (2.11.2)
rspec-mocks (2.11.2)
rspec-rails (2.11.0)
ruby-libvirt (0.3.0)
rubygems-bundler (0.9.0)
rvm (1.11.3.3)
sass (3.2.1)
soap4r (1.5.8)
sprockets (2.1.3)
sqlite3 (1.3.6)
sys-filesystem (1.0.0, 0.3.4)
terminal-table (1.4.5)
thor (0.16.0)
thoughtbot-shoulda (2.11.1)
tilt (1.3.3)
treetop (1.4.10)
typhoeus (0.3.3)
unf (0.0.5)
unf_ext (0.0.4)
webrobots (0.0.13)
will_paginate (3.0.3)
xml-simple (1.1.1)
gposton:puppet-dashboard/ (master✗) $ ruby -v
ruby 1.8.7 (2012-02-08 patchlevel 358) [i686-darwin11.3.0]
The code can be found on github
The easiest way to make specs work is to use Bundler.
bundle install
bundle exec rake spec
I have the following code:
require 'sinatra'
require 'datamapper'
DataMapper.setup :default, "postgres://localhost/mydb"
However, when I try and run it, I get:
LoadError: no such file to load -- dm-postgres-adapter
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:53:in `gem_original_require'
/Library/Ruby/Site/1.8/rubygems/custom_require.rb:53:in `require'
/Library/Ruby/Gems/1.8/gems/dm-core-1.1.0/lib/dm-core/adapters.rb:163:in `load_adapter'
/Library/Ruby/Gems/1.8/gems/dm-core-1.1.0/lib/dm-core/adapters.rb:133:in `adapter_class'
/Library/Ruby/Gems/1.8/gems/dm-core-1.1.0/lib/dm-core/adapters.rb:13:in `new'
/Library/Ruby/Gems/1.8/gems/dm-core-1.1.0/lib/dm-core.rb:219:in `setup'
These are the gems I have installed:
* LOCAL GEMS *
abstract (1.0.0)
actionmailer (3.0.9, 3.0.5, 2.3.5, 1.3.6)
actionpack (3.0.9, 3.0.5, 2.3.5, 1.13.6)
actionwebservice (1.2.6)
activemodel (3.0.9, 3.0.5)
activerecord (3.0.9, 3.0.5, 2.3.5, 1.15.6)
activeresource (3.0.9, 3.0.5, 2.3.5)
activesupport (3.0.9, 3.0.5, 2.3.5, 1.4.4)
acts_as_ferret (0.4.3)
addressable (2.2.6, 2.2.5)
arel (2.0.10, 2.0.9)
autotest (4.4.6)
autotest-fsevent (0.2.4)
autotest-growl (0.2.9)
autotest-rails-pure (4.1.2)
bcrypt-ruby (2.1.4)
builder (2.1.2)
bundler (1.0.10)
capistrano (2.5.2)
cgi_multipart_eof_fix (2.5.0)
configuration (1.2.0)
daemons (1.0.10)
data_objects (0.10.6)
datamapper (1.1.0)
diff-lcs (1.1.2)
dm-aggregates (1.1.0)
dm-constraints (1.1.0)
dm-core (1.2.0.rc2, 1.1.0)
dm-do-adapter (1.2.0.rc2, 1.1.0)
dm-migrations (1.1.0)
dm-postgres-adapter (1.2.0.rc2, 1.1.0)
dm-serializer (1.1.0)
dm-sqlite-adapter (1.2.0.rc2, 1.1.0)
dm-timestamps (1.1.0)
dm-transactions (1.1.0)
dm-types (1.1.0)
dm-validations (1.1.0)
dnssd (0.6.0)
do_postgres (0.10.6)
do_sqlite3 (0.10.6)
erubis (2.6.6)
eventmachine (0.12.10)
ezcrypto (0.7.2)
faraday (0.6.1)
faraday_middleware (0.6.3)
fastercsv (1.5.4)
fastthread (1.0.1)
fcgi (0.8.7)
ferret (0.11.6)
gem_plugin (0.2.3)
hashie (1.0.0)
heroku (1.18.1)
highline (1.5.0)
hpricot (0.8.4, 0.6.164)
i18n (0.5.0)
json (1.5.1, 1.4.6)
launchy (0.3.7)
less (1.2.21)
libxml-ruby (1.1.2)
liquid (2.2.2)
mail (2.2.19, 2.2.15)
mime-types (1.16)
mocha (0.9.12)
mongrel (1.1.5)
multi_json (0.0.5)
multi_xml (0.2.2)
multipart-post (1.1.0)
mutter (0.5.3)
needle (1.3.0)
net-scp (1.0.1)
net-sftp (2.0.1, 1.1.1)
net-ssh (2.0.4, 1.1.4)
net-ssh-gateway (1.0.0)
nokogiri (1.4.4)
oauth (0.4.5, 0.4.4)
polyglot (0.3.1)
rack (1.2.1, 1.0.1)
rack-mount (0.6.14, 0.6.13)
rack-test (0.5.7)
rails (3.0.9, 3.0.5, 2.3.5, 1.2.6)
railties (3.0.9, 3.0.5)
rake (0.8.7, 0.8.3)
rant (0.5.7)
rash (0.3.0)
rdoc (3.9.2)
RedCloth (4.1.1)
rest-client (1.6.1)
roauth (0.0.3)
rspec (2.6.0, 2.5.0)
rspec-core (2.6.4, 2.5.1)
rspec-expectations (2.6.0, 2.5.0)
rspec-mocks (2.6.0, 2.5.0)
rspec-rails (2.6.1, 2.5.0)
ruby-openid (2.1.2)
ruby-yadis (0.3.4)
rubygems-update (1.6.0)
rubynode (0.1.5)
sequel (3.20.0)
shotgun (0.9)
simple_oauth (0.1.4)
sinatra (1.2.3, 1.0)
spork (0.9.0.rc4)
sqlite3 (1.3.3)
sqlite3-ruby (1.2.4)
stringex (1.2.2)
sys-uname (0.8.5)
taps (0.3.23)
termios (0.9.4)
thor (0.14.6)
tilt (1.2.2)
treetop (1.4.9, 1.4.5)
tweetstream (1.0.4)
twitter (1.4.0)
twitter-stream (0.1.10)
twitter4r (0.7.0)
twitter_oauth (0.4.3)
tzinfo (0.3.24)
uuidtools (2.1.2)
visionmedia-growl (1.0.3)
webrat (0.7.1)
xmpp4r (0.4)
ZenTest (4.5.0)
You should use dm-core instead of datamapper in your require line.
Are you using Bundler? Provided you have bundler set up correctly, it should already be loaded for you.
Uninstalling dm-postgres-adapter 1.2.0.rc2 fixed it.