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find vs find_by vs where
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Model.find
1- Parameter: ID of the object to find.
2- If found: It returns the object (One object only).
3- If not found: raises an ActiveRecord::RecordNotFound exception.
Model.find_by
1- Parameter: key/value
Example:
User.find_by ...
How do I display an alert dialog on Android?
...tructor that allows you to specify a specific theme resource as the second parameter if you desire to do so.
new AlertDialog.Builder(context)
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
// Specifying a listener allows you to take an action befor...
Pip freeze vs. pip list
...the "requirements format".
Here, django==1.4.2 implies install django version 1.4.2 (even though the latest is 1.6.x).
If you do not specify ==1.4.2, the latest version available would be installed.
You can read more in "Virtualenv and pip Basics",
and the official "Requirements File Format" doc...
How do you echo a 4-digit Unicode character in Bash?
... I wouldn't call the above example quick (with 11 commands and their params)... Also it only handles 3 byte UTF-8 chars` (UTF-8 chars can be 1, 2, or 3 bytes)... This is a bit shorter and works for 1-3++++ bytes: printf "\\\x%s" $(printf '☠'|xxd -p -c1 -u) .... xxd is shipped as part of the...
Propagate all arguments in a bash shell script
... very simple script that calls another script, and I need to propagate the parameters from my current script to the script I am executing.
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How to do ssh with a timeout in a script?
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http://man7.org/linux/man-pages/man1/timeout.1.html
or you can use the param of ssh:
ssh -o ConnectTimeout=3 user@ip
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Why #egg=foo when pip-installing from git repo
...#egg=Package so pip knows what to expect at that URL. See https://pip.pypa.io/en/stable/reference/pip_install/#vcs-support
more on eggs
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What exactly are unmanaged resources?
...llector does not know about. For example:
Open files
Open network connections
Unmanaged memory
In XNA: vertex buffers, index buffers, textures, etc.
Normally you want to release those unmanaged resources before you lose all the references you have to the object managing them. You do this by cal...
Is there any Rails function to check if a partial exists?
...=> "#{dynamic_partial}" if File.exists?(Rails.root.join("app", "views", params[:controller], "_#{dynamic_partial}.html.erb")) %>
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MongoDB: Is it possible to make a case-insensitive query?
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new RegExp("^" + req.params.term.toLowerCase(), "i") also works fine
– Tahir Yasin
Mar 29 '17 at 15:43
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