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Find rows with multiple duplicate fields with Active Record, Rails & Postgres
...o, this is a little unrelated but handy. If you want to see how times each combination was found, put .size at the end:
User.select(:first,:email).group(:first,:email).having("count(*) > 1").size
and you'll get a result set back that looks like this:
{[nil, nil]=>512,
["Joe", "test@test.c...
“please check gdb is codesigned - see taskgated(8)” - How to get gdb installed with homebrew code si
...skgated
$ codesign -fs gdb-cert "$(which gdb)"
source http://andresabino.com/2015/04/14/codesign-gdb-on-mac-os-x-yosemite-10-10-2/
On macOS 10.12 (Sierra) and later, you must also
Use gdb 7.12.1 or later
Additionally prevent gdb from using a shell to start the program to be debugged. You can use...
What is the “__v” field in Mongoose
... it. The original release post explains it in detail: aaronheckmann.tumblr.com/post/48943525537/…
– Ricardo Tomasi
Sep 12 '13 at 19:04
2
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Mongoose query where value is not null
.../reference/operator/query The up-to-date doc about it, is here: mongoosejs.com/docs/api.html#query_Query-ne
– zeropaper
Jul 20 '14 at 7:52
...
S3 Error: The difference between the request time and the current time is too large
...te machine or on cloud, use internet to find the current time. timeanddate.com :)
– user_v
Apr 13 '12 at 13:31
...
How to extract a git subdirectory and make a submodule out of it?
...subtree from source (for older versions of git):
git clone https://github.com/apenwarr/git-subtree.git
cd git-subtree
sudo rsync -a ./git-subtree.sh /usr/local/bin/git-subtree
Or if you want the man pages and all
make doc
make install
Usage
Split a larger into smaller chunks:
# Go into the ...
How to display PDF file in HTML?
...
@SumanBogati The link is dead, new link: jsgyan.blogspot.com/2017/12/…
– mikiqex
Jun 12 at 9:46
...
What are all the differences between src and data-src attributes?
...
The attributes src and data-src have nothing in common, except that they are both allowed by HTML5 CR and they both contain the letters src. Everything else is different.
The src attribute is defined in HTML specs, and it has a functional meaning.
The data-src attribute ...
POST JSON to API using Rails and HTTParty
...ble to submit a ticket to my external ticket management system, squishlist.com. They have an api and instructions as follows. You need to authenticate and get a token and then submit the ticket with the token. From squishlist.
...
String concatenation in MySQL
...ame, " ", last_name) AS Name FROM test.student
As @eggyal pointed out in comments, you can enable string concatenation with the || operator in MySQL by setting the PIPES_AS_CONCAT SQL mode.
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