Validate method on request in Laravel - Step-by-Step Execution

Concept Flow - Validate method on request

Start HTTP Request

↓

Call Controller Method

↓

Call $request->validate()

↓

Check Validation Rules

↓

Continue

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Process Data

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End

The request hits the controller, validate() checks rules, if valid continues, else returns errors.

Execution Sample

Laravel

$validated = $request->validate([
    'name' => 'required|string|max:255',
    'email' => 'required|email',
]);

This code checks that 'name' and 'email' fields meet the rules, or returns errors.

Execution Table

Step	Action	Field	Rule Checked	Result	Next Step
1	Start validation	-	-	-	Check 'name' field
2	Check 'name'	name	required	Present	Check 'name' string
3	Check 'name'	name	string	Is string	Check 'name' max:255
4	Check 'name'	name	max:255	Length OK	Check 'email' field
5	Check 'email'	email	required	Present	Check 'email' email format
6	Check 'email'	email	email	Valid email	Validation passed
7	Validation passed	-	-	All rules passed	Return validated data
8	End	-	-	-	Continue processing

💡 Validation stops and returns errors if any rule fails; here all pass.

Variable Tracker

Variable	Start	After Step 2	After Step 5	Final
$validated	null	null	null	name: user input email: user input

Key Moments - 3 Insights

What happens if a required field is missing?

Validation immediately fails and returns errors instead of continuing, as shown by no further steps after failure in the execution_table.

Does validate() return data or just check?

It returns the validated data array if all rules pass, as shown in step 7 and variable_tracker final value.

Can multiple rules be checked on one field?

Yes, each rule is checked in order for the field, like 'required', 'string', 'max:255' for 'name' in steps 2-4.

Visual Quiz - 3 Questions

Look at the execution_table, what is the result of checking 'email' at step 6?

A Valid email

B Missing field

C Invalid format

D Too long

💡 Hint

Check the 'Result' column for step 6 in the execution_table.

At which step does the validation confirm all rules passed?

A Step 6

B Step 7

C Step 4

D Step 8

💡 Hint

Look for the step labeled 'Validation passed' in the execution_table.

If the 'name' field was missing, what would happen in the execution flow?

A Validation would pass anyway

B Validation would skip 'name' and check 'email'

C Validation would fail at step 2 and return errors

D Validation would continue but mark 'name' as empty

💡 Hint

Refer to key_moments about missing required fields and execution_table logic.

Concept Snapshot

Use $request->validate(rules) in controller.
Rules are strings like 'required', 'email', 'max:255'.
If validation fails, errors return automatically.
If passes, validated data returns.
Stops at first failure per field.
Good for quick input checks.

Full Transcript

When a user sends data to a Laravel controller, the validate method on the request checks the data against rules like required or email format. The process starts by calling $request->validate with rules. Each field is checked rule by rule. If a field fails a rule, validation stops and errors are returned to the user. If all rules pass, the validated data is returned and the controller continues processing. For example, the 'name' field is checked to be present, a string, and not too long. The 'email' field is checked to be present and a valid email. This method helps keep input safe and clean with minimal code.