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How do I make a column unique and index it in a Ruby on Rails migration?
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The short answer for old versions of Rails (see other answers for Rails 4+):
add_index :table_name, :column_name, unique: true
To index multiple columns together, you pass an array of column names instead of a single column name,
add_index :table_name, [:column_name_a, :column_name_b], unique...
How to silence output in a Bash script?
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kevinji
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answered Feb 18 '10 at 22:58
John KugelmanJohn Kug...
How to create a self-signed certificate with OpenSSL
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2242
You can do that in one command:
openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.p...
nvm keeps “forgetting” node in new terminal session
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answered Jul 5 '14 at 14:00
dylantsdylants
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What does $.when.apply($, someArray) do?
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answered Feb 8 '13 at 16:34
Rocket HazmatRocket Hazmat
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Read file data without saving it in Flask
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141
FileStorage contains stream field. This object must extend IO or file object, so it must contai...
Remove specific commit
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1 files changed, 11 insertions(+), 0 deletions(-)
create mode 100644 myfile
$ perl -p -i -e 's/line 2/this is the second line/;' myfile
$ git commit -am "changed line 2 to second line"
[master d6cbb19] changed line 2
1 files changed, 1 insertions(+), 1 deletions(-)
$ perl -p -i -e 's/lin...
Spring schemaLocation fails when there is no internet connection
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David ResnickDavid Resnick
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How to clone all repos at once from GitHub?
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answered Oct 24 '13 at 21:40
Thomas KelleyThomas Kelley
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How to build query string with Javascript
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answered Nov 25 '08 at 9:47
hasenhasen
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