我尝试使用,gem install pg但它似乎没有用.
gem install pg 给出了这个错误
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing pg:
ERROR: Failed to build gem native extension.
C:/Ruby/bin/ruby.exe extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
--with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. …我正在尝试将一个简单的应用程序推送到heroku并运行:
heroku rake db:migrate
但是我收到以下错误:
rake aborted!
PGError: ERROR: relation "posts" does not exist
: SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = '"posts"'::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)
我的迁移看起来像这样:
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.string :source
t.string :tweetid
t.string …