Is there a rails-way way to validate that an actual record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like: ...

... The keystore file generated by Keytool stores pairs of private and public keys. Each pair or entry stored in the keystore is refered by a unique alias. In brief: Keystore entry = private + public key pair = identified by an alias The keystore protects each private key with its in...

I have two lists, dates and values. I want to plot them using matplotlib. The following creates a scatter plot of my data. ...

...o the client side so it can do a redirection. I'm using Url.RouteUrl(..) and during my unit tests this fails since the Controller.Url parameter is not pre-filled. ...

...ou get a feel for it, you should trace out on paper what each operation is and account for the number of processes. Don't forget that fork() creates a near-perfect copy of the current process. The most significant difference (for most purposes) is that fork()'s return value differs between parent ...

...only extended in a single file, the compiler knows every possible subtypes and can reason about it. For instance with the declaration: sealed trait Answer case object Yes extends Answer case object No extends Answer The compiler will emit a warning if a match is not exhaustive: scala> val x:...

I'm looking at the docs for the IntStream , and I see an toArray method, but no way to go directly to a List<Integer> ...

... You are probably seeking: ActiveRecord::Base.connection.tables and ActiveRecord::Base.connection.columns('projects').map(&:name) You should probably wrap them in shorter syntax inside your .irbrc. share ...

...tion under the same "base" folder. This parent folder is a relative part and can vary based on Source Control settings. 5...

I’ve had a good look and can’t seem to find out how to select all elements matching certain classes in one jQuery selector statement such as this: ...