multiple fields in validates decorator

[dharani7998]

Fix for #1960

[deckar01]

Should we try to preserve this hook interface for a minor release? The docstring for set_hook says "You should not need to use this method directly". Any objection to making validates return a wrapper that loops the calls to set_hook instead?

[dharani7998]

I don't see how the wrapper will work if we loop and call set_hook, __marshmallow_hook__[VALIDATES] value gets overwritten each time and ends with the last argument passed in the validates decorator.

[deckar01]

c7bda74

[dharani7998]

It won't work, try this. It will only register the last field given in the decorator

from marshmallow import (
    Schema,
    fields,
    pre_dump,
    post_dump,
    pre_load,
    post_load,
    # pre_validate,
    validates,
    validates_schema,
    ValidationError,
    EXCLUDE,
    INCLUDE,
    RAISE,
)

class TestValidates(Schema):
    value = fields.Str()
    another_value = fields.Str()
    
    @validates('value', 'another_value')
    def validates_function(self, data, **kwargs):
        print(f'Inside validates: {{ {data}:{data} }}')


schema = TestValidates()
print(schema._hooks['validates'])
validator = getattr(schema, schema._hooks['validates'][0])
print(validator.__marshmallow_hook__)
print()



schema.load({
    'value': 'value',
    'another_value': 'another_value'
})