问题
How to execute rails commandline statement inside our rails controller
eg: I need to execute this statement
$rails new test -d postgresql
from my rails controller
def index
/Code to execute the command line statement/
end
Hope am clear..
回答1:
If you want to run shell commands inside controller just use "system"
Eg:
system "rails new test -d postgresql"
or else
exec "rails new test -d postgresql"
回答2:
Use backticks to shell out, like this:
`rails new test -d postgresql`
It might be smarter to use a job queue for this.
回答3:
To run command line statements inside controller, we can use system command
system "cd {path_to_folder}; rails new test -d postgresql"
回答4:
Like PradeepKumar said (would comment on it but can't due to rep):
system "cd {path_to_folder}; rails new test -d postgresql"
You have to declare all the commands you want to run in the same instruction (separated by a ;). I wasn't doing so (separated the cd command to access the directory with my runnable and the actually execution line in two different calls) and the result I was getting was not the desired.
For example, if you try to run:
system "cd {path_to_folder}"
And then:
system "rails new test -d postgresql"
The rails command wont be executed in the context of the path_to_folder but in the default location for the command line interface (for instance C:\Users\Me) or the environment of your Rails program.
Also I was getting an error on command execution which I fixed by adding a & in the end of the command. In this case that the instructions has two commands, I added it in the end of the first command (before the ;).
来源：https://stackoverflow.com/questions/11948192/commandline-statement-inside-rails-controller