if constant is optional, don't force to value

ChangeLog.md

@@ -1,5 +1,16 @@
 # Change Log
 
+### 2021-06-16 - 5.8.1
+
+min Autorest core version: 3.3.0
+
+min Modelerfour version: 4.19.1
+
+**Bug Fixes**
+
+- Fix optional properties with constant schemas. Now, properties that have constant schemas but are optional will not have the hardcoded constant value,
+but will default to its `x-ms-client-default` or `None`  #952
+
 ### 2021-05-17 - 5.8.0
 
 min Autorest core version: 3.3.0

autorest/codegen/models/object_schema.py

@@ -129,7 +129,6 @@ def fill_instance_from_yaml(self, namespace: str, yaml_data: Dict[str, Any], **k
             # map of discriminator value to child's name
             for children_yaml in yaml_data["discriminator"]["immediate"].values():
                 subtype_map[children_yaml["discriminatorValue"]] = children_yaml["language"]["python"]["name"]
-
         if yaml_data.get("properties"):
             properties += [
                 Property.from_yaml(p, has_additional_properties=len(properties) > 0, **kwargs)

autorest/codegen/models/parameter.py

@@ -173,7 +173,7 @@ def in_method_signature(self) -> bool:
 
     @property
     def in_method_code(self) -> bool:
-        return not (isinstance(self.schema, ConstantSchema) and self.location == ParameterLocation.Other)
+        return not (self.constant and self.location == ParameterLocation.Other)
 
     @property
     def implementation(self) -> str:

autorest/codegen/models/property.py

@@ -32,26 +32,36 @@ def __init__(
         self.required: bool = yaml_data.get("required", False)
         self.readonly: bool = yaml_data.get("readOnly", False)
         self.is_discriminator: bool = yaml_data.get("isDiscriminator", False)
-        # this bool doesn't consider you to be constant if you are a discriminator
-        self.constant: bool = isinstance(self.schema, ConstantSchema) and not self.is_discriminator
-
         if description:
             self.description = description
         else:
             self.description = yaml_data["language"]["python"]["description"]
 
-        validation_map: Dict[str, Union[bool, int, str]] = {}
+        self.client_default_value = client_default_value
+
+    @property
+    def constant(self) -> bool:
+        # this bool doesn't consider you to be constant if you are a discriminator
+        # you also have to be required to be considered a constant
+        return (
+            isinstance(self.schema, ConstantSchema) and
+            self.required and
+            not self.is_discriminator
+        )
+
+    @property
+    def validation_map(self) -> Optional[Dict[str, Union[bool, int, str]]]:
+        retval: Dict[str, Union[bool, int, str]] = {}
         if self.required:
-            validation_map["required"] = True
+            retval["required"] = True
         if self.readonly:
-            validation_map["readonly"] = True
+            retval["readonly"] = True
         if self.constant:
-            validation_map["constant"] = True
+            retval["constant"] = True
         if self.schema.validation_map:
             validation_map_from_schema = cast(Dict[str, Union[bool, int, str]], self.schema.validation_map)
-            validation_map.update(validation_map_from_schema)
-        self.validation_map = validation_map or None
-        self.client_default_value = client_default_value
+            retval.update(validation_map_from_schema)
+        return retval or None
 
     @property
     def escaped_swagger_name(self) -> str:

autorest/codegen/serializers/model_base_serializer.py

@@ -62,14 +62,19 @@ def prop_documentation_string(prop: Property) -> str:
             description += "."
         if prop.name == "tags":
             description = "A set of tags. " + description
-        if prop.required:
+
+        if prop.constant:
+            description += f' Has constant value: {prop.constant_declaration}.'
+        elif prop.required:
             if description:
                 description = "Required. " + description
             else:
                 description = "Required. "
-        if prop.constant:
-            constant_prop = cast(ConstantSchema, prop.schema)
-            description += f' Default value: "{constant_prop.value}".'
+        elif isinstance(prop.schema, ConstantSchema):
+            description += (
+                f" The only acceptable values to pass in are None and {prop.constant_declaration}. " +
+                f"The default value is {prop.default_value_declaration}."
+            )
         if prop.is_discriminator:
             description += "Constant filled by server. "
         if isinstance(prop.schema, EnumSchema):

dev_requirements.txt

@@ -7,3 +7,4 @@ pytest
 ptvsd
 mypy
 black
+types-PyYAML

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@autorest/python",
-    "version": "5.8.0",
+    "version": "5.8.1",
     "description": "The Python extension for generators in AutoRest.",
     "scripts": {
         "prepare": "node run-python3.js prepare.py",
@@ -28,7 +28,7 @@
     },
     "devDependencies": {
         "@autorest/autorest": "^3.0.0",
-        "@microsoft.azure/autorest.testserver": "^3.0.23"
+        "@microsoft.azure/autorest.testserver": "^3.0.24"
     },
     "files": [
         "autorest/**/*.py",

test/azure/Expected/AcceptanceTests/AzureSpecials/azurespecialproperties/models/_models.py

@@ -19,7 +19,7 @@ class Error(msrest.serialization.Model):
 
     :param status:
     :type status: int
-    :ivar constant_id: Required.  Default value: "1".
+    :ivar constant_id:  Has constant value: 1.
     :vartype constant_id: int
     :param message:
     :type message: str

test/azure/Expected/AcceptanceTests/AzureSpecials/azurespecialproperties/models/_models_py3.py

@@ -21,7 +21,7 @@ class Error(msrest.serialization.Model):
 
     :param status:
     :type status: int
-    :ivar constant_id: Required.  Default value: "1".
+    :ivar constant_id:  Has constant value: 1.
     :vartype constant_id: int
     :param message:
     :type message: str

test/vanilla/AcceptanceTests/asynctests/test_model_flattening.py

@@ -214,6 +214,7 @@ async def test_model_flattening_simple(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo",
             generic_value = "https://generic"
         )
@@ -230,6 +231,7 @@ async def test_model_flattening_with_parameter_flattening(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo"
         )
         simple_product.additional_properties = {} # Not the purpose of this test. This enables the ==.
@@ -238,6 +240,7 @@ async def test_model_flattening_with_parameter_flattening(self, client):
             "123", # product_id
             "product description", # description
             "max name", # max_product_display_name
+            "Large",  # capacity
             None, # generic_value
             "http://foo", # odata_value
         )
@@ -252,6 +255,7 @@ async def test_model_flattening_with_grouping(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo"
         )
         simple_product.additional_properties = {} # Not the purpose of this test. This enables the ==.
@@ -260,6 +264,7 @@ async def test_model_flattening_with_grouping(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name="max name",
+            capacity="Large",
             odata_value="http://foo",
             name="groupproduct")
 

test/vanilla/AcceptanceTests/test_model_flattening.py

@@ -208,6 +208,7 @@ def test_model_flattening_simple(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo",
             generic_value = "https://generic"
         )
@@ -223,6 +224,7 @@ def test_model_flattening_with_parameter_flattening(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo"
         )
         simple_product.additional_properties = {} # Not the purpose of this test. This enables the ==.
@@ -231,6 +233,7 @@ def test_model_flattening_with_parameter_flattening(self, client):
             "123", # product_id
             "product description", # description
             "max name", # max_product_display_name
+            "Large",  # capacity
             None, # generic_value
             "http://foo", # odata_value
         )
@@ -244,6 +247,7 @@ def test_model_flattening_with_grouping(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name = "max name",
+            capacity="Large",
             odata_value = "http://foo"
         )
         simple_product.additional_properties = {} # Not the purpose of this test. This enables the ==.
@@ -252,6 +256,7 @@ def test_model_flattening_with_grouping(self, client):
             product_id = "123",
             description = "product description",
             max_product_display_name="max name",
+            capacity="Large",
             odata_value="http://foo",
             name="groupproduct")
 

test/vanilla/Expected/AcceptanceTests/BodyString/bodystring/models/_models.py

@@ -37,8 +37,7 @@ class RefColorConstant(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar color_constant: Required. Referenced Color Constant Description. Default value:
-     "green-color".
+    :ivar color_constant: Referenced Color Constant Description. Has constant value: "green-color".
     :vartype color_constant: str
     :param field1: Sample string.
     :type field1: str

test/vanilla/Expected/AcceptanceTests/BodyString/bodystring/models/_models_py3.py

@@ -39,8 +39,7 @@ class RefColorConstant(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar color_constant: Required. Referenced Color Constant Description. Default value:
-     "green-color".
+    :ivar color_constant: Referenced Color Constant Description. Has constant value: "green-color".
     :vartype color_constant: str
     :param field1: Sample string.
     :type field1: str

test/vanilla/Expected/AcceptanceTests/Constants/constants/models/_models.py

@@ -164,47 +164,35 @@ def __init__(self, **kwargs):
 class NoModelAsStringNoRequiredOneValueDefault(msrest.serialization.Model):
     """NoModelAsStringNoRequiredOneValueDefault.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
-    :ivar parameter:  Default value: "value1".
-    :vartype parameter: str
+    :param parameter:  The only acceptable values to pass in are None and "value1". The default
+     value is "value1".
+    :type parameter: str
     """
 
-    _validation = {
-        "parameter": {"constant": True},
-    }
-
     _attribute_map = {
         "parameter": {"key": "parameter", "type": "str"},
     }
 
-    parameter = "value1"
-
     def __init__(self, **kwargs):
         super(NoModelAsStringNoRequiredOneValueDefault, self).__init__(**kwargs)
+        self.parameter = kwargs.get("parameter", "value1")
 
 
 class NoModelAsStringNoRequiredOneValueNoDefault(msrest.serialization.Model):
     """NoModelAsStringNoRequiredOneValueNoDefault.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
-    :ivar parameter:  Default value: "value1".
-    :vartype parameter: str
+    :param parameter:  The only acceptable values to pass in are None and "value1". The default
+     value is None.
+    :type parameter: str
     """
 
-    _validation = {
-        "parameter": {"constant": True},
-    }
-
     _attribute_map = {
         "parameter": {"key": "parameter", "type": "str"},
     }
 
-    parameter = "value1"
-
     def __init__(self, **kwargs):
         super(NoModelAsStringNoRequiredOneValueNoDefault, self).__init__(**kwargs)
+        self.parameter = kwargs.get("parameter", None)
 
 
 class NoModelAsStringNoRequiredTwoValueDefault(msrest.serialization.Model):
@@ -246,7 +234,7 @@ class NoModelAsStringRequiredOneValueDefault(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar parameter: Required.  Default value: "value1".
+    :ivar parameter:  Has constant value: "value1".
     :vartype parameter: str
     """
 
@@ -271,7 +259,7 @@ class NoModelAsStringRequiredOneValueNoDefault(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar parameter: Required.  Default value: "value1".
+    :ivar parameter:  Has constant value: "value1".
     :vartype parameter: str
     """
 

test/vanilla/Expected/AcceptanceTests/Constants/constants/models/_models_py3.py

@@ -176,47 +176,35 @@ def __init__(self, *, parameter: Union[str, "ModelAsStringRequiredTwoValueNoDefa
 class NoModelAsStringNoRequiredOneValueDefault(msrest.serialization.Model):
     """NoModelAsStringNoRequiredOneValueDefault.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
-    :ivar parameter:  Default value: "value1".
-    :vartype parameter: str
+    :param parameter:  The only acceptable values to pass in are None and "value1". The default
+     value is "value1".
+    :type parameter: str
     """
 
-    _validation = {
-        "parameter": {"constant": True},
-    }
-
     _attribute_map = {
         "parameter": {"key": "parameter", "type": "str"},
     }
 
-    parameter = "value1"
-
-    def __init__(self, **kwargs):
+    def __init__(self, *, parameter: Optional[str] = "value1", **kwargs):
         super(NoModelAsStringNoRequiredOneValueDefault, self).__init__(**kwargs)
+        self.parameter = parameter
 
 
 class NoModelAsStringNoRequiredOneValueNoDefault(msrest.serialization.Model):
     """NoModelAsStringNoRequiredOneValueNoDefault.
 
-    Variables are only populated by the server, and will be ignored when sending a request.
-
-    :ivar parameter:  Default value: "value1".
-    :vartype parameter: str
+    :param parameter:  The only acceptable values to pass in are None and "value1". The default
+     value is None.
+    :type parameter: str
     """
 
-    _validation = {
-        "parameter": {"constant": True},
-    }
-
     _attribute_map = {
         "parameter": {"key": "parameter", "type": "str"},
     }
 
-    parameter = "value1"
-
-    def __init__(self, **kwargs):
+    def __init__(self, *, parameter: Optional[str] = None, **kwargs):
         super(NoModelAsStringNoRequiredOneValueNoDefault, self).__init__(**kwargs)
+        self.parameter = parameter
 
 
 class NoModelAsStringNoRequiredTwoValueDefault(msrest.serialization.Model):
@@ -262,7 +250,7 @@ class NoModelAsStringRequiredOneValueDefault(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar parameter: Required.  Default value: "value1".
+    :ivar parameter:  Has constant value: "value1".
     :vartype parameter: str
     """
 
@@ -287,7 +275,7 @@ class NoModelAsStringRequiredOneValueNoDefault(msrest.serialization.Model):
 
     All required parameters must be populated in order to send to Azure.
 
-    :ivar parameter: Required.  Default value: "value1".
+    :ivar parameter:  Has constant value: "value1".
     :vartype parameter: str
     """