Best Laravel Eloquent Tips and Tricks

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Laravel Tips List of Laravel Tips 1. Increments and Decrements

13. Raw query methods

2. XorY methods

14. Replicate: make a copy of a row

3. Model boot() method

15. Chunk() method for big tables

4. Relationship with conditions and ordering

16. Create additional things when creating a

5. Model properties: timestamps, appends etc.

model

6. Find multiple entries

17. Override updated_at when saving

7. WhereX

18. What is the result of an update()?

8. Order by relationship

19. Transform brackets into an Eloquent query

9. Eloquent::when() – no more if-else’s

20. orWhere with multiple parameters

10. BelongsTo Default Models

21. onDelete('set null')

11. Order by Mutator

22. dropForeign([]);

12. Default ordering in global scope

23. Model Validation

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Laravel Tips 1. Increments and Decrements Instead of this:

Do this:

Also these will work:

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Laravel Tips 2. XorY Methods Eloquent has quite a few functions that combine two methods, like “please do X, otherwise do Y”.

Ex 1 – findOrFail(): Instead of:

Do this:

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Laravel Tips 2. XorY Methods Ex 2 – firstOrCreate():

Instead of:

Do this:

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Laravel Tips 3. Model boot() method There is a magical place called boot() in an Eloquent model where you can override default behavior:

Probably one of the most popular examples is setting some field value at the moment of creating the model object.

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Laravel Tips 4. Relationship with conditions and ordering Define Relationship:

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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Laravel Tips 5. Model properties: timestamps, appends etc.

There are a few “parameters” of an Eloquent model, in the form of properties of that class. The most popular ones are probably these:

there’s more:

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Laravel Tips 6. Find multiple entries find() Method

Few people know about that it can accept multiple IDs as an array:

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Laravel Tips 7. WhereX There’s an elegant way to turn this:

Do this:

Also, there are some pre-defined methods in Eloquent, related to date/time:

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Laravel Tips 8. Order by Relationship Separate relationship for the latest post on the topic:

And then, in our controller, we can do this “magic�:

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

there’s a better way – to use when():

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

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Laravel Tips 10 BelongsTo Default Models Post belonging to Author and then Blade code:

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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Laravel Tips 11 Order by Mutator Guess you have this:

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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Laravel Tips 12 Default ordering in global scope 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.

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

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

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

Instead of:

Do this:

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Laravel Tips 16 Create additional things when creating a model This Artisan command:

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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Laravel Tips 17 Override updated_at when saving ->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:

Overriding default updated_at with our pre-defined one.

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Laravel Tips 18 What is the result of an update()?

This code actually returns?

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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Laravel Tips 19 Transform brackets into an Eloquent query and-or mix SQL query, like this:

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

Do this:

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Laravel Tips 21 onDelete('set null') 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.

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Laravel Tips 22 dropForeign([]); when rolling back multiple foreign keys using array syntax didn't work.

the array syntax on dropForeign is for dropping a foreign key using a shorthand column name.

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

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

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

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Laravel Tips 23 Model Validation

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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.

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