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How to rollback a specific migration?
...e error in the original post)
rake db:migrate VERSION=20100905201547
In order to rollback ONLY ONE specific migration (OUT OF ORDER) use:
rake db:migrate:down VERSION=20100905201547
Note that this will NOT rollback any interceding migrations -- only the one listed. If that is not what you inte...
Setting PATH environment variable in OSX permanently
...
You have to add it to /etc/paths.
Reference (which works for me) : Here
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Injecting $scope into an angular service function()
... }());
}]);
One thing to note is that within your service, in order for the students property to be visible, it needs to be on the Service object or this like so:
this.students = $http.get(path).then(function (resp) {
return resp.data;
});
...
Optimal way to concatenate/aggregate strings
...LECT
ID,
Name,
ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Name) AS NameNumber,
COUNT(*) OVER (PARTITION BY ID) AS NameCount
FROM dbo.SourceTable
),
Concatenated AS
(
SELECT
ID,
CAST(Name AS nvarchar) AS FullName,
Name,
Nam...
The type must be a reference type in order to use it as parameter 'T' in the generic type or method
...koverflow.com%2fquestions%2f6451120%2fthe-type-must-be-a-reference-type-in-order-to-use-it-as-parameter-t-in-the-gen%23new-answer', 'question_page');
}
);
Post as a guest
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What is the difference between a database and a data warehouse?
...e acount that how they say over, OLTP Tables they have to be normalized in order not to have inconsistences . the normalization is not so complicated to do in a E-R schema but it´s much more complicate for Star-Schema or Snow-Flow thats. These Schemas are made to ease a read in the Database and no...
Rails has_and_belongs_to_many migration
...le with only a restaurant_id and user_id (no primary key), in alphabetical order.
First run your migrations, then edit the generated migration file.
Rails 3
rails g migration create_restaurants_users_table
Rails 4:
rails g migration create_restaurants_users
Rails 5
rails g migration Create...
What is the relationship between Looper, Handler and MessageQueue in Android?
... Also note that a thread can't be associated with more than one Looper. In order to guarantee this association, Looper is stored in thread-local storage, and it can't be created via its constructor directly. The only way to create it is to call prepare static method on Looper. prepare method first e...
403 Forbidden vs 401 Unauthorized HTTP responses
... (or 3xx: redirection)
Checks are usually done in this order:
404 if resource is public and does not exist or 3xx redirection
OTHERWISE:
401 if not logged-in or session expired
403 if user does not have permission to access resource (file, json, ...)
404 if resource does not ex...
What's the point of map in Haskell, when there is fmap?
... [b] -- Defined in ‘GHC.Base’
and you'll see it defined as an high-order function applicable to a list of values of any type a yielding a list of values of any type b. Although polymorphic (the a and b in the above definition stand for any type) the map function is intended to be applied to ...