fix: exclude unwrappable dictionaries for pydantic preset (#1860)

docs/languages/Python.md

@@ -17,6 +17,9 @@ There are special use-cases that each language supports; this document pertains
 In some cases you might want to use [pydantic](https://pypi.org/project/pydantic/) data validation and settings management using Python type hints for the models.
 Modelina follows Pydantic v2.
 
+There are some limitations to the current implementation:
+1. The preset doesn't unwrap properties of type `ConstrainedDictionaryModel` with `serialilzationType = unwrap`, they are simply excluded from the serialization
+
 You can find an example of its use [here](../../examples/generate-python-pydantic-models/index.ts)
 
 ## Generate models with JSON Serializer and Deserializer methods

src/generators/python/presets/Pydantic.ts

@@ -1,4 +1,7 @@
-import { ConstrainedUnionModel } from '../../../models';
+import {
+  ConstrainedDictionaryModel,
+  ConstrainedUnionModel
+} from '../../../models';
 import { PythonOptions } from '../PythonGenerator';
 import { ClassPresetType, PythonPreset } from '../PythonPreset';
 
@@ -38,7 +41,14 @@ const PYTHON_PYDANTIC_CLASS_PRESET: ClassPresetType<PythonOptions> = {
       : undefined;
     const defaultValue = params.property.required ? undefined : 'default=None';
     const jsonAlias = `serialization_alias='${params.property.unconstrainedPropertyName}'`;
-    const fieldTags = [description, defaultValue, jsonAlias].filter(
+    let exclude = undefined;
+    if (
+      params.property.property instanceof ConstrainedDictionaryModel &&
+      params.property.property.serializationType === 'unwrap'
+    ) {
+      exclude = 'exclude=True';
+    }
+    const fieldTags = [description, defaultValue, jsonAlias, exclude].filter(
       (value) => value
     );
     return `${propertyName}: ${type} = Field(${fieldTags.join(', ')})`;

test/generators/python/presets/__snapshots__/Pydantic.spec.ts.snap

@@ -6,23 +6,23 @@ exports[`PYTHON_PYDANTIC_PRESET should render pydantic for class 1`] = `
     multi
     line
     description''', default=None, serialization_alias='prop')
-  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties')
+  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties', exclude=True)
 "
 `;
 
 exports[`PYTHON_PYDANTIC_PRESET should render union to support Python < 3.10 1`] = `
 Array [
   "class UnionTest(BaseModel): 
   unionTest: Optional[Union[Union1, Union2]] = Field(default=None, serialization_alias='unionTest')
-  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties')
+  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties', exclude=True)
 ",
   "class Union1(BaseModel): 
   testProp1: Optional[str] = Field(default=None, serialization_alias='testProp1')
-  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties')
+  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties', exclude=True)
 ",
   "class Union2(BaseModel): 
   testProp2: Optional[str] = Field(default=None, serialization_alias='testProp2')
-  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties')
+  additionalProperties: Optional[dict[Any, Any]] = Field(default=None, serialization_alias='additionalProperties', exclude=True)
 ",
 ]
 `;