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How to check if a model has a certain column/attribute?
...? attr_name where attr_name is the string name of your attribute.
In this case: Number.column_names.include? 'one'
For an instance
Use record.has_attribute?(:attr_name) or record.has_attribute?('attr_name') (Rails 3.2+) or record.attributes.has_key? attr_name.
In this case: number.has_attribute?...
what's the meaning of '=?' in angularJS directive isolate scope declaration?
...Yes:
The 'isolate' scope takes an object hash which defines a set of local scope properties derived from the parent scope. These local properties are useful for aliasing values for templates. Locals definition is a hash of local scope property to its source:
= or =attr - set up bi-direct...
How can I verify if a Windows Service is running
I have an application in C# (2.0 running on XP embedded) that is communicating with a 'watchdog' that is implemented as a Windows Service. When the device boots, this service typically takes some time to start. I'd like to check, from my code, if the service is running. How can I accomplish this?
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How would you compare jQuery objects?
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Can shorten to: if(this.parentNode === document.body);
– ehynds
Sep 29 '11 at 16:14
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JavaScript exponents
...There is an exponentiation operator, which is part of the ES7 final specification. It is supposed to work in a similar manner with python and matlab:
a**b // will rise a to the power b
Now it is already implemented in Edge14, Chrome52, and also it is available with traceur or babel.
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How to revert to origin's master branch's version of file
I'm in my local computer's master branch of a cloned master-branch of a repo from a remote server.
3 Answers
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Chrome Developer Tools: How to find out what is overriding a CSS rule?
...lement inspector. Expand the property of interest to see the list of applicable rules, and which one won.
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GitHub: What is a “wip” branch?
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On GitHub, pull requests are prefixed by [WIP] to indicate that the pull requestor
has not yet finished his work on the code (thus, work in progress), but
looks for have some initial feedback (early-pull strategy), and
wants to use the continuous integration infrastructure of...
Loading custom configuration files
I know I can open config files that are related to an assembly with the static ConfigurationManager.OpenExe(exePath) method but I just want to open a config that is not related to an assembly. Just a standard .NET config file.
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How do I view the list of functions a Linux shared library is exporting?
...cSetThreadContext
000140f0 T alcSuspendContext
U atanf
U calloc
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Exported sumbols are indicated by a T. Required symbols that must be loaded from other shared objects have a U. Note that the symbol table does not include just functions, but exported variables as well.
See t...