85636682

如果系统是ubuntu12，系统默认自带Postgresql9.1，首先我们把它删除了！
步骤：
1、列出关于postgre9.1的包
dpkg -l | grep postgres 
如果是9.1，下面列表的8.3就是9.1，有一些包可能没有，是系统而定。
ii  postgresql                            8.3.17-0ubuntu0.8.04.1           object-relational SQL database (latest versi
ii  postgresql-8.3                        8.3.9-0ubuntu8.04                object-relational SQL database, version 8.3
ii  postgresql-client                     8.3.9-0ubuntu8.04                front-end programs for PostgreSQL (latest ve
ii  postgresql-client-8.3                 8.3.9-0ubuntu8.04                front-end programs for PostgreSQL 8.3
ii  postgresql-client-common              87ubuntu2                        manager for multiple PostgreSQL client versi

barelyknown

###
Unobtrusive JavaScript solution for polling in a Rails application

Introduction:

Add a polling-placeholder wrapper div to any partial and add a data attribute
named poll that should be equal to "true" until you want to stop polling.
The default polling frequency will be used unless you provide an "interval" data
attribute which should be the number of milliseconds to use for the interval.

them0nk

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

zhengjia

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')