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Many-to-many relationship with the same model in rails?
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For reference: the Rails documentation on the subject. There's a section called “Many-to-many”, and of course the documentation on the class methods themselves.
Simplest scenario, uni-directional, no additional fields
This is the most compact in code.
I'll start out with this basic schema fo...
Python style - line continuation with strings? [duplicate]
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Since adjacent string literals are automatically joint into a single string, you can just use the implied line continuation inside parentheses as recommended by PEP 8:
print("Why, hello there wonderful "
"stackoverflow people!")
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How to get the browser to navigate to URL in JavaScript [duplicate]
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This works in all browsers:
window.location.href = '...';
If you wanted to change the page without it reflecting in the browser back history, you can do:
window.location.replace('...');
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Is SQL syntax case sensitive?
... are case-insensitive (SELECT, FROM, WHERE, etc), but are often written in all caps. However in some setups table and column names are case-sensitive. MySQL has a configuration option to enable/disable it. Usually case-sensitive table and column names are the default on Linux MySQL and case-insensit...
Return anonymous type results?
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Do DataGrids not allow you to specify the property as "Dog.Name"? I forget now why I hate them enough never to use them...
– teedyay
Feb 11 '09 at 16:06
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Preloading CSS Images
...ly elements guaranteed to exist on the page.
For the "trick" to work, we shall use the content property which comfortably allows setting multiple URLs to be loaded, but as shown, the ::after pseudo element is kept hidden so the images won't be rendered:
body::after{
position:absolute; width:0; he...
What are the differences between a pointer variable and a reference variable in C++?
...compiling error
int &r = *p; <--- likely no compiling error, especially if the nullptr is hidden behind a function call, yet it refers to a non-existent int at address 0
Pointers can iterate over an array; you can use ++ to go to the next item that a pointer is pointing to, and + 4 to go to...
Why seal a class?
...framework. What is the benefit of sealing a class? I cannot fathom how not allowing inheritance can be useful and most likely not the only one fighting these classes.
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Command to list all files in a folder as well as sub-folders in windows
I tried searching for a command that could list all the file in a directory as well as subfolders using a command prompt command.
I have read the help for "dir" command but coudn't find what I was looking for.
Please help me what command could get this.
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How to debug a single thread in Visual Studio?
...rrect and usable way is to:
Hit Ctrl+A in the breakpoints window (select all breakpoints).
Right click and select "Filter...".
Enter "ThreadId=(current thread id)".
In Visual Studio 2015 and newer, the process is similar:
Hit Ctrl+A in the breakpoints window (select all breakpoints).
Right cli...