Wrapping a list of element and primitive nodes

[cercide]

📒 Description

XML data structures commonly wrap element and primitive collections. For instance, a library may have several books
and and other stuff as well. In terms of OpenAPI 3, these data
structures are wrapped. Hence, this PR introduces the field parameter wrapper, which wraps any element/primitive
collection into a custom xml element without the need of a dedicated wrapper class.

from dataclasses import dataclass, field
from typing import List
from xsdata.formats.dataclass.serializers import XmlSerializer
from xsdata.formats.dataclass.serializers.config import SerializerConfig

config = SerializerConfig(pretty_print=True, xml_declaration=False)
serializer = XmlSerializer(config=config)

@dataclass
class Library:
    books: List[str] = field(
        metadata={
            "wrapper": "Books",
            "name": "Title",
            "type": "Element",
        }
    )

obj = Library(
    books = [
        "python for beginners",
        "beautiful xml",
    ]
)

print(serializer.render(obj))

<Library>
  <Books>
    <Title>python for beginners</Title>
    <Title>beautiful xml</Title>
  </Books>
</Library>

Resolves #709

🔗 What I've Done

First, a new metadata attribute wrapper indicates that a list is wrapped by an xml object.

Next, when the serializer writes a list, the wrapper attribute triggers XmlWriterEvent.START end before the serializer writes the list. Afterwards, an XmlWriterEvent.END event follows vice versa .

Finally, the parser introduces the class WrapperNode as a subclass of XmlNode. The WrapperNode class is a wrapper for the parent element and lines up into the node queue.

💬 Comments

This is a great library to work in pythonik way with xml. Thank you for your efforts!

🛫 Checklist

• Updated docs
• Added unit-tests
• Sample tests pass
• W3C tests pass

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (0e84311) compared to base (a93f186).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #710   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          100       101    +1     
  Lines         8741      8776   +35     
  Branches      2212      2220    +8     
=========================================
+ Hits          8741      8776   +35     

Impacted Files	Coverage Δ
xsdata/utils/testing.py	100.00% <ø> (ø)
xsdata/formats/dataclass/context.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/models/builders.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/models/elements.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/parsers/bases.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/parsers/nodes/__init__.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/parsers/nodes/wrapper.py	100.00% <100.00%> (ø)
xsdata/formats/dataclass/serializers/xml.py	100.00% <100.00%> (ø)

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[tefra]

Looks good @cercide let's also take care of the coverage please

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[tefra]

Thank you for the contribution @cercide this is something I wanted to tackle at some point!!!