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Validate

What is schema.Validate()?​

To validate your data you can use the schema.Validate() function. The function signature looks like this:

schema.Validate(dataPointer, options...)

This works with any Zog Schema:

// string
data := "test"
z.String().Min(3).Validate(&data)
// structs
user := User{Name: "test"}
z.Struct(z.Schema{"name": z.String().Min(3)}).Validate(&user)

Required and Zero Values​

One quirk of schema.Validate() is that it will consider zero values as invalid if the schema is required. For example:

var data int
z.Int().Required().Validate(&data) // Error: int is required
data = 0
z.Int().Required().Validate(&data) // Error: int is required

To fix this you can use a pointer:

var data *int
z.Ptr(z.Int()).NotNil().Validate(&data) // Error: pointer is nil
*data = 0
z.Ptr(z.Int()).NotNil().Validate(&data) // No error