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Check if a table exists in Rails
...? 'kittens'
In Rails 2, 3 & 4 the API is about tables.
# Listing of all tables and views
ActiveRecord::Base.connection.tables
# Checks for existence of kittens table/view (Kitten model)
ActiveRecord::Base.connection.table_exists? 'kittens'
Getting the status of migrations:
# Tells you all...
Easy way to list node modules I have npm linked?
...ts (e.g. ls -l node_modules | grep ^l)? They're normal symlinks.
If you really need to find all symlinks, you could try something like find / -type d -name "node_modules" 2>/dev/null | xargs -I{} find {} -type l -maxdepth 1 | xargs ls -l.
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Is there an SQLite equivalent to MySQL's DESCRIBE [table]?
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You can use ".schema" without a table and it'll show you all of them.
– Dan Benamy
Nov 30 '12 at 6:16
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Using git repository as a database backend
...d in my case. I'd like to emphasize that this rationale might not apply to all cases, so it's up to architect to decide.
Generally, the first main point my question misses is that I'm dealing with multi-user system that work in parallel, concurrently, using my server with a thin client (i.e. just a...
Is the order guaranteed for the return of keys and values from a LinkedHashMap object?
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The Map interface provides three
collection views, which allow a map's contents to be viewed as a set
of keys, collection of values, or set
of key-value mappings. The order of
a map is defined as the order in which
the iterators on the map's collection
views return their ...
Docker - a way to give access to a host USB or serial device?
... give container access to host serial or USB port . Is there a trick which allows doing that?
9 Answers
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The “unexpected ++” error in jslint [duplicate]
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This doesn't really explain the 'adds' confusion' bit. @samir-talwar adds an explaination.
– Matt Clarkson
Sep 12 '11 at 13:44
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Where and why do I have to put the “template” and “typename” keywords?
...iler doesn't need to know the meaning of a name in order to parse and basically know what action a line of code does. In C++, the above however can yield vastly different interpretations depending on what t means. If it's a type, then it will be a declaration of a pointer f. However if it's not a ty...
Why “no projects found to import”?
...ject into workspace". As the "root directory" I select the directory where all my .java (and .class) files are located. Eclipse writes me that "no projects are found to import". Why?
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UITableViewCell show white background and cannot be modified on iOS7
...ull said, "...there seems to be a bug in interface builder...", I'm not totally sure whether it does have the bug, but seems so cause his comment got several up votes. So there might something wrong if you use IB. :)
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