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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
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Instead of this:
1. Increments and Decrements
Do this:
Also these will work:
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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:
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Ex 2 – firstOrCreate():
Instead of:
2. XorY Methods
Do this:
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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.
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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:
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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:
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find() Method
6. Find multiple entries
Few people know about that it can accept multiple IDs as an array:
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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:
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Separate relationship for the latest post on the topic:
8. Order by Relationship
And then, in our controller, we can do this “magic”:
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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():
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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
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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:
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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.
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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
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Add raw queries to our Eloquent statements. functions for that.
13 Raw query methods

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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
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Still powerful – to process bigger datasets, you can chunk them into pieces.
Instead of:
15 Chunk() method for big tables
Do this:
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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
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->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.
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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.
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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:
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pass an array of parameters to orWhere().
“Usual” way:
20 orWhere with multiple parameters
Do this:
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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')
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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.
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Here is drop foreign:
22 dropForeign([]);
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22 dropForeign([]);
abstracted call to dropIndexCommand which looks like this:
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23 Model Validation
This approach was inspired by the Elixir framework, Phoenix.
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23 Model Validation
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23 Model Validation
if your front-end only ends values that have changes for updating, you don't
want all fields marked as required.
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