feat: Allow empty strings for directive prefixes (#285)

docs: Add hint mentioning that pydantic directive prefixes allow empty strings

docs/source/users/configuration.rst

@@ -178,7 +178,13 @@ Contains all modifications for pydantic `BaseModel`.
    :directive_option: model-signature-prefix
    :values: pydantic model, class, foobar
 
-   Define the signature prefix for pydantic models.
+   Define the signature prefix for pydantic model. This is especially useful
+   when you want to distinguish pydantic models from other classes.
+
+   .. hint::
+
+      An empty string is also a valid value. This will remove the prefix
+      completely.
 
 
 .. config_description:: autopydantic_model
@@ -395,7 +401,13 @@ Contains all modifications for pydantic `BaseSettings`.
    :directive_option: settings-signature-prefix
    :values: pydantic settings, class, foobar
 
-   Define the signature prefix for pydantic settings.
+   Define the signature prefix for pydantic settings. This is especially useful
+   when you want to distinguish pydantic settings from other classes.
+
+   .. hint::
+
+      An empty string is also a valid value. This will remove the prefix
+      completely.
 
 
 .. config_description:: autopydantic_settings
@@ -575,7 +587,13 @@ Fields
    :enable: members, field-doc-policy=docstring
    :values: field, attribute, foobar
 
-   Define the signature prefix for pydantic field.
+   Define the signature prefix for pydantic fields. This is especially useful
+   when you want to distinguish pydantic fields from other attributes.
+
+   .. hint::
+
+      An empty string is also a valid value. This will remove the prefix
+      completely.
 
 
 ----------
@@ -621,7 +639,13 @@ Validators
    :enable: members, model-show-validator-members, undoc-members
    :values: validator, classmethod, foobar
 
-   Define the signature prefix for pydantic validator.
+   Define the signature prefix for pydantic validators. This is especially useful
+   when you want to distinguish pydantic validators from other attributes. 
+
+   .. hint::
+
+      An empty string is also a valid value. This will remove the prefix
+      completely.
 
 
 -------

sphinxcontrib/autodoc_pydantic/directives/directives.py

@@ -33,7 +33,6 @@ class PydanticDirectiveMixin:
     """Base class for pydantic directive providing common functionality."""
 
     config_name: str
-    default_prefix: str
 
     def __init__(self, *args) -> None:  # noqa: ANN002
         super().__init__(*args)
@@ -44,15 +43,18 @@ def get_signature_prefix(self, *_) -> list[Node]:  # noqa: ANN002
 
         config_name = f'{self.config_name}-signature-prefix'
         prefix = self.pyautodoc.get_value(config_name)
-        value = prefix or self.default_prefix
+
+        # empty prefix should not add any nodes
+        if prefix == '':
+            return []
 
         # account for changed signature in sphinx 4.3, see #62
         if sphinx.version_info < (4, 3):
-            return f'{value} '  # type: ignore[return-value]
+            return f'{prefix} '  # type: ignore[return-value]
 
         from sphinx.addnodes import desc_sig_space
 
-        return [Text(value), desc_sig_space()]
+        return [Text(prefix), desc_sig_space()]
 
 
 class PydanticModel(PydanticDirectiveMixin, PyClasslike):
@@ -67,7 +69,6 @@ class PydanticModel(PydanticDirectiveMixin, PyClasslike):
     )
 
     config_name = 'model'
-    default_prefix = 'class'
 
 
 class PydanticSettings(PydanticDirectiveMixin, PyClasslike):
@@ -82,7 +83,6 @@ class PydanticSettings(PydanticDirectiveMixin, PyClasslike):
     )
 
     config_name = 'settings'
-    default_prefix = 'class'
 
 
 class PydanticField(PydanticDirectiveMixin, PyAttribute):
@@ -102,7 +102,6 @@ class PydanticField(PydanticDirectiveMixin, PyAttribute):
     )
 
     config_name = 'field'
-    default_prefix = 'attribute'
 
     def get_field_name(self, sig: str) -> str:
         """Get field name from signature. Borrows implementation from
@@ -218,7 +217,6 @@ class PydanticValidator(PydanticDirectiveMixin, PyMethod):
     )
 
     config_name = 'validator'
-    default_prefix = 'classmethod'
 
     def get_field_href_from_mapping(
         self, inspector: ModelInspector, mapping: ValidatorFieldMap

tests/test_configuration_fields.py

@@ -885,8 +885,7 @@ def test_autodoc_pydantic_field_signature_prefix_directive(parse_rst):
 
     # empty
     doctree = parse_rst(input_rst, conf={'autodoc_pydantic_field_signature_prefix': ''})
-    prefix = desc_annotation_directive_prefix('attribute')
-    assert_node(doctree[1][0][0], [desc_annotation, prefix])
+    assert_node(doctree[1][0][0], [desc_addname, 'FieldSignaturePrefix.'])
 
     # custom
     input_rst = [

tests/test_configuration_model.py

@@ -1,7 +1,7 @@
 """This module contains tests for pydantic model configurations."""
 
 import pytest
-from sphinx.addnodes import desc_annotation
+from sphinx.addnodes import desc_annotation, desc_addname
 from sphinx.testing.util import assert_node
 
 from sphinxcontrib.autodoc_pydantic.directives.autodocumenters import (
@@ -1271,8 +1271,7 @@ def test_autodoc_pydantic_model_signature_prefix_directive(parse_rst):
 
     # empty
     doctree = parse_rst(input_rst, conf={'autodoc_pydantic_model_signature_prefix': ''})
-    prefix = desc_annotation_directive_prefix('class')
-    assert_node(doctree[1][0][0], [desc_annotation, prefix])
+    assert_node(doctree[1][0][0], [desc_addname, 'target.configuration.'])
 
     # custom
     input_rst = [

tests/test_configuration_settings.py

@@ -2,12 +2,13 @@
 
 from typing import List
 
-from sphinx.addnodes import desc_annotation
+from sphinx.addnodes import desc_addname, desc_annotation
 from sphinx.testing.util import assert_node
 
 from sphinxcontrib.autodoc_pydantic.directives.autodocumenters import (
     PydanticSettingsDocumenter,
 )
+
 from .compatibility import desc_annotation_directive_prefix
 
 KWARGS = dict(documenter=PydanticSettingsDocumenter.objtype, deactivate_all=True)
@@ -1004,10 +1005,10 @@ def test_autodoc_pydantic_settings_signature_prefix(autodocument, parse_rst):
     actual = autodocument(options_doc={'settings-signature-prefix': ''}, **kwargs)
     assert result == actual
 
-
-def test_autodoc_pydantic_settings_signature_prefix_directive(parse_rst):
     """Tests pydantic_settings directive."""
 
+
+def test_autodoc_pydantic_settings_signature_prefix_directive(parse_rst):
     # default
     input_rst = [
         '',
@@ -1026,8 +1027,7 @@ def test_autodoc_pydantic_settings_signature_prefix_directive(parse_rst):
     doctree = parse_rst(
         input_rst, conf={'autodoc_pydantic_settings_signature_prefix': ''}
     )
-    prefix = desc_annotation_directive_prefix('class')
-    assert_node(doctree[1][0][0], [desc_annotation, prefix])
+    assert_node(doctree[1][0][0], [desc_addname, 'target.configuration.'])
 
     # custom
     input_rst = [

tests/test_configuration_validator.py

@@ -1,23 +1,25 @@
 """This module contains tests for pydantic validator configurations."""
 
 from docutils.nodes import (
-    paragraph,
     emphasis,
+    paragraph,
 )
 from sphinx.addnodes import (
     desc,
-    desc_signature,
-    desc_name,
-    desc_content,
-    desc_annotation,
     desc_addname,
-    pending_xref,
+    desc_annotation,
+    desc_content,
+    desc_name,
+    desc_signature,
     index,
+    pending_xref,
 )
 from sphinx.testing.util import assert_node
+
 from sphinxcontrib.autodoc_pydantic.directives.autodocumenters import (
     PydanticValidatorDocumenter,
 )
+
 from .compatibility import desc_annotation_directive_prefix
 
 KWARGS = dict(documenter=PydanticValidatorDocumenter.objtype, deactivate_all=True)
@@ -449,8 +451,7 @@ def test_autodoc_pydantic_validator_signature_prefix_directive(parse_rst):
     doctree = parse_rst(
         input_rst, conf={'autodoc_pydantic_validator_signature_prefix': ''}
     )
-    prefix = desc_annotation_directive_prefix('classmethod')
-    assert_node(doctree[1][0][0], [desc_annotation, prefix])
+    assert_node(doctree[1][0][0], [desc_addname, 'ValidatorSignaturePrefix.'])
 
     # custom
     input_rst = [