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PG undefinedtable error relation users does not exist
...migrations. It will only use the
contents of the current schema.rb file. If a migration can't be rolled back,
rake db:reset may not help you. To find out more about dumping the schema see
Schema Dumping and You section. Rails Docs
If the trick doesn't help, drop the database, then re-create ...
Automating the InvokeRequired code pattern
...
Lee's approach can be simplified further
public static void InvokeIfRequired(this Control control, MethodInvoker action)
{
// See Update 2 for edits Mike de Klerk suggests to insert here.
if (control.InvokeRequired) {
control.Invoke(a...
When to use symbols instead of strings in Ruby?
If there are at least two instances of the same string in my script, should I instead use a symbol?
4 Answers
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Python debugging tips [closed]
...s possible to execute arbitrary Python expressions using pdb. For example, if you find a mistake, you can correct the code, then type a type expression to have the same effect in the running code
ipdb is a version of pdb for IPython. It allows the use of pdb with all the IPython features including ...
Preferred order of writing latitude & longitude tuples in GIS services
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EPSG:4326 specifically states that the coordinate order should be latitude, longitude. Many software packages still use longitude, latitude ordering. This situation has wreaked unimaginable havoc on project deadlines and programmer sanity....
How to get a DOM Element from a JQuery Selector
...erience). Take your checkbox example:
$(":checkbox").click(function() {
if ($(this).is(":checked")) {
// do stuff
}
});
is more "jquery'ish" and (imho) more concise. What if you wanted to number them?
$(":checkbox").each(function(i, elem) {
$(elem).data("index", i);
});
$(":checkbox")....
C# elegant way to check if a property's property is null
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could you explain what this does? What is value equal to if PropertyC is null? or if PropertyB is null? what if Object A is null?
– Kolob Canyon
May 18 '19 at 3:04
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How to see query history in SQL Server Management Studio
Is the query history stored in some log files? If yes, can you tell me how to find their location? If not, can you give me any advice on how to see it?
...
How can I scale an entire web page with CSS?
...s there, Firefox still does not support it sadly.
Also, this is slightly different than your zoom. The css transform works like an image zoom, so it will enlarge your page but not cause reflow, etc.
Edit updated the transform origin.
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AngularJS : Why ng-bind is better than {{}} in angular?
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If you are not using ng-bind, instead something like this:
<div>
Hello, {{user.name}}
</div>
you might see the actual Hello, {{user.name}} for a second before user.name is resolved (before the data is loaded)...