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Example code of i-am-tom/schemer

Informations about the package schemer

Schemer Build Status

Schemer is a Joi-inspired library for validating and formatting data structures. Complex structures' validators can be constructed by composition.

Quickstart

The full API can be accessed via the Schemer\Validator and Schemer\Formatter sets of static functions. We'll bring them in with an alias:

Now, we'll declare a validator and a formatter:

We've used the Assoc validator and formatter to create more complicated validators that nest data. The Collection interfaces can do similar things for sequential arrays. So, let's look at the formatter:

We see that age is now an integer, and the friends key has been created with an empty array, as per the formatting instructions. When handling data from other sources, you'll probably want to attempt to format the data before validating it.

Validation comes in two flavours. First, we'll start with simple validation:

This flattens all the errors down to one Result whose errors method will return them in an array. While this may be suitable for validation of API requests, for example, it's often helpful for the structure of the errors to mimic the structure of the data. This can be achieved using nestedValidate:

Although the above represents the result as an array, it is actually an instance of Schemer\NestedResult, which implements both ArrayAccess and Traversable, which allows you to use foreach syntax as well as array access to get at the results (e.g. $output['age']->errors() === ['missing key']). If there's a nestable (Assoc or Collection) within your structure, nestedValidate will recurse down through these in the same pattern, too!

Well, that's all there is to it! The API will fill in the rest of the blanks.

API

All methods are immutable. Calling a method will return a new object, and not change the previous one in any way:

Schemer\Formatter

Schemer\Validator

Many of these methods accept an optional custom $error string, which overrides the default error.

Contributing

Get involved! PRs are cool.

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