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A migration to add unique constraint to a combination of columns
... unique: true
Trying to create two similar records will throw a database error (Postgres in my case):
ActiveRecord::RecordNotUnique: PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "index_ownerships_on_user_id_and_post_id"
DETAIL: Key (user_id, post_id)=(1, 1) already...
Add a column to a table, if it does not already exist
...ry for MS SQL Server that adds a column into a table. But I don't want any error display, when I run/execute the following query.
...
How to handle Objective-C protocols that contain properties?
... it in a concrete class that conforms to that protocol -- I get a compiler error claiming it's an undeclared variable. No typos confirmed.
– Coocoo4Cocoa
May 10 '09 at 4:26
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How can I send an HTTP POST request to a server from Excel using VBA?
...from being misleading and unclear, this can eventually result in a runtime error if the argument is an object. And although not explicitly asked for, usually you would want to use the HTTP response, which you could mention can be retrieved by objHTTP.responseText.
– Leviathan
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How can you find the height of text on an HTML canvas?
The spec has a context.measureText(text) function that will tell you how much width it would require to print that text, but I can't find a way to find out how tall it is. I know it's based on the font, but I don't know to convert a font string to a text height.
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Multiple arguments to function called by pthread_create()?
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@sigjuice, It doesn't work for me. I see compilation error: invalid conversion from ‘void*’ to ‘arg_struct*’.
– Neshta
Oct 15 '14 at 17:17
add a ...
What's faster, SELECT DISTINCT or GROUP BY in MySQL?
...you state a specific DBMS that you have tested to see that it generates an error for this statement.
– daniel.gindi
Sep 15 '13 at 11:53
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Which ORM should I use for Node.js and MySQL? [closed]
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I get this error "Error: Cannot find module 'hat'" when I try to deploy this. .. no amount of npm install or re-install seems to help. Any suggestions? Thanks
– Gene Bo
May 28 '15 at 17:19
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how to get the cookies from a php curl into a variable
...the downside is that it requires CURLOPT_RETURNTRANSFER to be on, else it error out, and that it will overwrite CURLOPT_STDERR and CURLOPT_VERBOSE, if you were already using them for something else.. (i might fix this later)
example of how to use it:
<?php
header("content-type: text/plain;cha...
Node.js: how to consume SOAP XML web service
...ction':"http://Main.Service/AUserService/GetUsers"
}
};
let callback = (error, response, body) => {
if (!error && response.statusCode == 200) {
console.log('Raw result', body);
var xml2js = require('xml2js');
var parser = new xml2js.Parser({explicitArray: false, trim: tru...