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Rails DB Migration - How To Drop a Table?
... information about how to accomplish different tasks in a migration here:
http://api.rubyonrails.org/classes/ActiveRecord/Migration.html
More specifically, you can see how to drop a table using the following approach:
drop_table :table_name
...
Inversion of Control vs Dependency Injection
...lic void SendConfirmationMsg(string mobileNumber)
{
SMSService _SMSService = new SMSService();
_SMSService.SendSMS(mobileNumber, "Your order has been shipped successfully!");
}
}
Above implementation is not wrong but there are few issues:
-) Suppose On development environm...
Does “git fetch --tags” include “git fetch”?
... git fetch --tags fetches tags in addition to what are fetched by the same command line without the option.
See commit c5a84e9 by Michael Haggerty (mhagger):
Previously, fetch's "--tags" option was considered equivalent to specifying the refspec
refs/tags/*:refs/tags/*
on the command ...
Context switches much slower in new linux kernels
...erformance problem in recent kernels has to do with the switch to the intel_idle cpuidle driver from acpi_idle, the driver used in older kernels. Sadly, the intel_idle driver ignores the user's BIOS configuration for the C-states and dances to its own tune. In other words, even if you completely dis...
How to extract an assembly from the GAC?
...
The method described here is very easy:
http://andreasglaser.net/post/2008/08/05/Extract-assembly-from-Global-Assembly-Cache-(GAC)-with-network-drive-mapping.aspx
Summary from Article:
Map a Network Drive (Explorer -> Tools)
Map to \servername\folder (\\You...
Optimise PostgreSQL for fast testing
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Swift native base class or NSObject
... Objective-C classes, but implement only a handful of methods for NSObject compatibility
do not use objc_msgSend() for calls to their methods (by default)
do not provide Objective-C runtime metadata for their method implementations (by default)
Subclassing NSObject in Swift gets you Objective-C ru...
Overriding a JavaScript function while referencing the original
...raps existing functions, applies this and passes arguments correctly. See: http://underscorejs.org/#wrap
How to correctly save instance state of Fragments in back stack?
...tManager()
.beginTransaction()
.add(R.id.my_container, myFragment, MY_FRAGMENT_TAG)
.commit();
} else {
myFragment = (MyFragment) getSupportFragmentManager()
.findFragmentByTag(MY_FRAGMENT_TAG);
}
...
}
Note however th...
Determine Whether Two Date Ranges Overlap
...
Proof:
Let ConditionA Mean that DateRange A Completely After DateRange B
_ |---- DateRange A ------|
|---Date Range B -----| _
(True if StartA > EndB)
Let ConditionB Mean that DateRange A is Completely Before DateRange B
|---- DateRange A ...