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Running V8 Javascript Engine Standalone
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V8 is easy to build and does not come with the Java VM overhead from Mozilla's standalone Javascript interpreter. Luckily, V8 ships with code for building a console. Here is how to build this:
$> svn co http://v8.googlecode.com/svn/trunk v8-trunk
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$&...
How to install a previous exact version of a NPM package?
...ample: npm install express@3.0.0
You can also add the --save flag to that command to add it to your package.json dependencies, or --save --save-exact flags if you want that exact version specified in your package.json dependencies.
The install command is documented here: https://docs.npmjs.com/cli...
Rails find_or_create_by more than one attribute?
...e factored out of rails just the attribute specific ones.
https://github.com/rails/rails/blob/4-2-stable/guides/source/active_record_querying.md
Example
GroupMember.find_or_create_by_member_id_and_group_id(4, 7)
became
GroupMember.find_or_create_by(member_id: 4, group_id: 7)
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MongoDB/NoSQL: Keeping Document Change History
A fairly common requirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can wri...
How to map calculated properties with JPA and Hibernate
...SQL fragment:
@Formula("PRICE*1.155")
private float finalPrice;
Or even complex queries on other tables:
@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;
Where id is the id of the current entity.
The following blog post is worth the...
Set the absolute position of a view
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Using git to get just the latest revision
... set to 1 to create a shallow clone with a history truncated to the latest commit.
For example:
git clone --depth 1 https://github.com/user/repo.git
To also initialize and update any nested submodules, also pass --recurse-submodules and to clone them shallowly, also pass --shallow-submodules.
For e...
Android Facebook integration with invalid key hash
... key is wrong. You may get the hash key using two steps.
One is through a command prompt. Another one is through coding. The hash key through a command prompt is working on the first time only. I don't know the reason. I have also got the same problem. So I tried it through programmatically.
Follo...
Creating an empty bitmap and drawing though canvas in Android
...reating bitmap I am getting OutOfMemoryError please see this stackoverflow.com/questions/24303759/…
– user123456
Jun 23 '14 at 5:25
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Fixed page header overlaps in-page anchors
...n my site (unrelated to anchors) been driving me crazy. Your non-clickable comment really helped. I owe ya big!
– zipzit
Mar 21 '14 at 16:27
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