Best Laravel Eloquent Tips and Tricks

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Laravel Tips
1. Increments and Decrements
2. XorY methods
3. Model boot() method
4. Relationship with conditions and ordering
5. Model properties: timestamps, appends etc.
6. Find multiple entries
7. WhereX
8. Order by relationship
9. Eloquent::when() – no more if-else’s
10. BelongsTo Default Models
11. Order by Mutator
12. Default ordering in global scope
13. Raw query methods
14. Replicate: make a copy of a row
15. Chunk() method for big tables
16. Create additional things when creating a
model
17. Override updated_at when saving
18. What is the result of an update()?
19. Transform brackets into an Eloquent query
20. orWhere with multiple parameters
21. onDelete('set null')
22. dropForeign([]);
23. Model Validation
List of Laravel Tips

Instead of this:
1. Increments and Decrements
Do this:
Also these will work:
Laravel Tips

Eloquent has quite a few functions that combine two methods, like “please do X,
otherwise do Y”.
Ex 1 – findOrFail():
Instead of:
2. XorY Methods
Do this:
Laravel Tips

Ex 2 – firstOrCreate():
Instead of:
2. XorY Methods
Do this:
Laravel Tips

There is a magical place called boot() in an Eloquent model where you can override
default behavior:
3. Model boot() method
Probably one of the most popular examples is setting some field value at the
moment of creating the model object.
Laravel Tips

Define Relationship:
4. Relationship with conditions and ordering
Already add where or orderBy?
For example, if you want a specific relationship for some type of users, also ordered
by email, you can do this:
Laravel Tips

There are a few “parameters” of an Eloquent model, in the form of properties of
that class. The most popular ones are probably these:
5. Model properties: timestamps, appends etc.
there’s more:
Laravel Tips

find() Method
6. Find multiple entries
Few people know about that it can accept multiple IDs as an array:
Laravel Tips

There’s an elegant way to turn this:
7. WhereX
Do this:
Also, there are some pre-defined methods in Eloquent, related to date/time:
Laravel Tips

Separate relationship for the latest post on the topic:
8. Order by Relationship
And then, in our controller, we can do this “magic”:
Laravel Tips

write conditional queries with “if-else”, something like this:
9 Eloquent::when() – no more if-else’s
there’s a better way – to use when():
Laravel Tips

It may not feel shorter or more elegant, but the most powerful is passing of the
parameters:
9 Eloquent::when() – no more if-else’s
Laravel Tips

Post belonging to Author and then Blade code:
10 BelongsTo Default Models
But what if the author is deleted, or isn’t set for some reason? You will get an error,
something like “property of non-object”.
Of course, you can prevent it like this:
But you can do it on Eloquent relationship level:
Laravel Tips

Guess you have this:
11 Order by Mutator
Now, you want to order by that full_name? This won’t work:
Solution is simple. We need to order the results after we get them.
Function name is different – it’s not orderBy, it’s sortBy.
Laravel Tips

What if you want to have User::all() always be ordered by name field? You can
assign a global scope. Let’s go back to the boot() method, which we mentioned
already above.
12 Default ordering in global scope
Laravel Tips

Add raw queries to our Eloquent statements. functions for that.
13 Raw query methods

Short one. Without deep explanations, here’s the best way to make a copy of
database entry:
14 Replicate: make a copy of a row
Laravel Tips

Still powerful – to process bigger datasets, you can chunk them into pieces.
Instead of:
15 Chunk() method for big tables
Do this:
Laravel Tips

This Artisan command:
16 Create additional things when creating a model
There are three useful flags to generate related files to the model?
 m will create a migration file
 c will create a controller
 r will indicate that controller should be resourceful
Laravel Tips

->save() method can accept parameters? As a result, we can tell it to
“ignore” updated_at default functionality to be filled with current timestamp.
See this:
17 Override updated_at when saving
Overriding default updated_at with our pre-defined one.
Laravel Tips

This code actually returns?
18 What is the result of an update()?
what would that $result contain? The answer is affected rows. So if you need to
check how many rows were affected, you don’t need to call anything else –
update() method will return this number for you.
Laravel Tips

and-or mix SQL query, like this:
19 Transform brackets into an Eloquent query
How to translate it into Eloquent? This is the wrong way:
The order will be incorrect. The right way is a little more complicated, using closure
functions as sub-queries:
Laravel Tips

pass an array of parameters to orWhere().
“Usual” way:
20 orWhere with multiple parameters
Do this:
Laravel Tips

Used onDelete('cascade'); on foreign keys in Laravel migrations, know about 'set
null'? This allows you to preserve models when their related model is deleted.
21 onDelete('set null')
Laravel Tips

when rolling back multiple foreign keys using array syntax didn't work.
22 dropForeign([]);
the array syntax on dropForeign is for dropping a foreign key using a shorthand
column name.
Laravel Tips

Here is drop foreign:
22 dropForeign([]);
Laravel Tips

22 dropForeign([]);
abstracted call to dropIndexCommand which looks like this:
Laravel Tips

23 Model Validation
This approach was inspired by the Elixir framework, Phoenix.
Laravel Tips

23 Model Validation
Laravel Tips

23 Model Validation
if your front-end only ends values that have changes for updating, you don't
want all fields marked as required.
Laravel Tips

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