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Combine two ActiveRecord::Relation objects
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If you want to combine using AND (intersection), use merge:
first_name_relation.merge(last_name_relation)
If you want to combine using OR (union), use or†:
first_name_relation.or(last_name_relation)
† Only in ActiveRecord 5+; for 4.2 install ...
SSL handshake alert: unrecognized_name error since upgrade to Java 1.7.0
...tain misconfigured servers send an "Unrecognized Name" warning in the SSL handshake which is ignored by most clients... except for Java. As @Bob Kerns mentioned, the Oracle engineers refuse to "fix" this bug/feature.
As workaround, they suggest to set the jsse.enableSNIExtension property. To allow ...
how does array[100] = {0} set the entire array to 0?
...at don't have a specified value, the compiler initializes pointers to NULL and arithmetic types to zero (and recursively applies this to aggregates).
The behavior of this code in C++ is described in section 8.5.1.7 of the C++ specification (online draft of C++ spec): the compiler aggregate-initial...
CALayer with transparent hole in it
I have a simple view (left side of the picture) and i need to create some kind of overlay (right side of the picture) to this view. This overlay should have some opacity, so the view bellow it is still partly visible.
Most importantly this overlay should have a circular hole in the middle of it so i...
iphone ios running in separate thread
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In my opinion, the best way is with libdispatch, aka Grand Central Dispatch (GCD). It limits you to iOS 4 and greater, but it's just so simple and easy to use. The code to do some processing on a background thread and then do something with the results in the main run loop is inc...
Pandas: drop a level from a multi-level column index?
... If the index you are trying to drop is on the left (row) side and not the top (column) side, you can change "columns" to "index" and use the same method: >>> df.index = df.index.droplevel(1)
– Idodo
Nov 28 '18 at 12:13
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Accessing console and devtools of extension's background.js
I just started out with Google Chrome extensions and I can't seem to log to console from my background js. When an error occurs (because of a syntax error, for example), I can't find any error messages either.
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Why is there an unexplainable gap between these inline-block div elements? [duplicate]
...is determined by the font-size, you could simply reset the font-size to 0, and thus remove the space between the elements.
Just set font-size: 0 on the parent elements, and then declare a new font-size for the children elements. This works, as demonstrated here (example)
#parent {
font-size: 0...
Shortcut to open file in Vim
...ption of autofill. Invoke a keyboard shortcut, type the file name/pattern, and choose from all the matching files names.
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Shell script “for” loop syntax
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There is no good reason to use an external command such as seq to count and increment numbers in the for loop, hence it is recommend that you avoid using seq. This command is left for compatibility with old bash. The built-in commands are fast enough. for (( EXP1; EXP2; ...