Computing the differences or deltas between Eloquent models is a common task in many data oriented apps. The easiest way that I have found out how to do so is below:
Awhile back I needed to save an Eloquent model to the DB so that I might compute a delta later on. Json serves this purpose nicely since the json data type is now natively supported in many languages.
very quickly that they are not in Kansas anymore. For starters, without using some of ES2015’s goodness (ES6 previously)
let, this means that variables cascade down the function chain.
FROM clause in MySql is completed first and it provides the table from which other operations will be run.
Even with that essential description, some constructions of the FROM can be difficult to understand and provide you
with wildly unexpected results.
Generating integer sequences (e.g. all numbers between 20 and 100) in MySql is much harder than it needs to be. Other DBMS products have had such support for quite awhile.
As a fun mental exercise I whipped this up. Is this really useful? Probably not. It is really a “code kata” if nothing else. I wouldn’t recommend using stored procedures in most situations since it is generally considered good practice to keep your logic in your code and not in the database layer.
I was needing to improve the performance of a pivot table seeder recently and decided to use a generator to do it.
Interestingly, one of the easiest to implement iterators is the
yield syntax introduced in PHP 5.5. It allows for good abstraction
between the data that is to be iterated and the source of said data. That can lead to significant performance increases
as well since it might, depending on the use case, reduce database calls or the amount of data being stored in memory among other things.
Basically what the
yield syntax does is it returns an instance of the
Generator class for that sequence in the loop.
next() is called on the
Generator class (which
yield is) PHP then resumes with the state from when the
yield statement was called. It continues on until there is nothing
left to yield.
Sometimes Eloquent doesn’t provide all of the functionality and access to data that you need out of the box. Even Taylor Otwell, the framework’s creator, often uses query builder for his DB operations.
With the release of PHP 7 just around the corner, a quick start guide seems to be in order. This guide was written with Linux in mind but it should work ok with Mac OS X. If you are on Windows, you should switch to Linux (or maybe Mac) :). Let’s get a testing environment set up.
The first of the SOLID principles is unfortunately violated quite often even though it is easy to understand why you want to maintain a separation of concerns. It is similar to the SQL injection vulnerabilities that show up on StackOverflow and other places even though the internet is flooded with warnings about how to avoid being pwnd by the easily escapable beast.
If you are trying to set an expectation for
\Closure using mockery, you may have seen this error:
I don’t like manually creating a table of contents on Github so this is how I figured out how to generate it.
I would give the Lenovo T440s a 5 out of 5 if it were not for the trackpad. The rest of the computer is rock solid and really a great setup. The keyboard is my favorite because of the feel of the keys, the sound the keys make, and the keys’ apparent ruggedness. With the tweaks below, it makes the trackpad bearable though it still could use improvement.