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PG undefinedtable error relation users does not exist
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At first, you shall detach all connections out of database. By default you use the development environment. Then try to reset database with the following:
rake db:reset
The rake db:reset task will drop the database and set it up again....
Sign APK without putting keystore info in build.gradle
...yPassword=...
keyAlias=...
storeFile=...
Add this to your build.gradle:
allprojects {
afterEvaluate { project ->
def propsFile = rootProject.file('keystore.properties')
def configName = 'release'
if (propsFile.exists() && android.signingConfigs.hasProperty(...
How do I make Git use the editor of my choice for commits?
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For Sublime Text:
Add this to the .gitconfig. The --wait is important (it allows to type text in sublime and will wait for save/close event.)
[core]
editor = 'subl' --wait
'subl' can be replaced by the full path of the executable but is usually available when correctly installed.
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How can I wait In Node.js (JavaScript)? l need to pause for a period of time
... console.log('Welcome to My Console,');
}
function function2() {
// all the stuff you want to happen after that pause
console.log('Blah blah blah blah extra-blah');
}
// call the first chunk of code right away
function1();
// call the rest of the code and have it execute after 3 seconds...
Get next / previous element using JavaScript?
... page
var selectionDiv = document.getElementById("MySecondDiv");
So basically with selectionDiv iterate through the collection to find its index, and then obviously -1 = previous +1 = next within bounds
for(var i = 0; i < divs.length;i++)
{
if(divs[i] == selectionDiv)
{
var previous...
In Java 8 how do I transform a Map to another Map using a lambda?
...rEach((s, integer) -> map2.put(s, integer));
And because we're just calling an existing method we can use a method reference, which gives us:
map.forEach(map2::put);
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What Makes a Method Thread-safe? What are the rules?
Are there overall rules/guidelines for what makes a method thread-safe? I understand that there are probably a million one-off situations, but what about in general? Is it this simple?
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Is it possible to “await yield return DoSomethingAsync()”
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What you are describing can be accomplished with the Task.WhenAll method. Notice how the code turns into a simple one-liner. What happens is that each individual url begins downloading and then WhenAll is used combine those operations into a single Task which can be awaited.
Task<IE...
Convert light frequency to RGB?
...teachers may have told us (well mine did). Too bad, but in practice not usually fatal.
– Francis Davey
May 29 '10 at 22:58
1
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Strip HTML from Text JavaScript
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@Magnus Smith: Yes, if whitespace is a concern - or really, if you have any need for this text that doesn't directly involve the specific HTML DOM you're working with - then you're better off using one of the other solutions given here. The primary advantages of this method are ...