fix: correctly handle nillable complex attributes that have a Get method (#114)

Author: bahkauv70

templates/go/model_simple.mustache

@@ -120,7 +120,7 @@ func New{{classname}}WithDefaults() *{{classname}} {
 // Deprecated
 {{/deprecated}}
 func (o *{{classname}}) Get{{name}}() *{{#isNumber}}float64{{/isNumber}}{{#isFloat}}float64{{/isFloat}}{{#isDouble}}float64{{/isDouble}}{{#isInteger}}int64{{/isInteger}}{{#isLong}}int64{{/isLong}}{{^isNumeric}}{{vendorExtensions.x-go-base-type}}{{/isNumeric}} {
-	if o == nil{{#isNullable}}{{^vendorExtensions.x-golang-is-container}} || o.{{name}}.Get() == nil{{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
+	if o == nil|| IsNil(o.{{name}}) {{#isNullable}}{{^vendorExtensions.x-golang-is-container}} || o.{{name}}.Get() == nil{{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
 		var ret *{{#isNumber}}float64{{/isNumber}}{{#isFloat}}float64{{/isFloat}}{{#isDouble}}float64{{/isDouble}}{{#isInteger}}int64{{/isInteger}}{{#isLong}}int64{{/isLong}}{{^isNumeric}}{{vendorExtensions.x-go-base-type}}{{/isNumeric}}
 		return ret
 	}
@@ -178,6 +178,9 @@ func (o *{{classname}}) Set{{name}}(v *{{#isNumber}}float64{{/isNumber}}{{#isFlo
 	o.{{name}} = v
 {{/vendorExtensions.x-golang-is-container}}
 {{^vendorExtensions.x-golang-is-container}}
+	if IsNil(o.{{name}}) {
+		o.{{name}} = new({{dataType}})
+	}
 	o.{{name}}.Set(&v)
 {{/vendorExtensions.x-golang-is-container}}
 {{/isNullable}}
@@ -193,7 +196,7 @@ func (o *{{classname}}) Set{{name}}(v *{{#isNumber}}float64{{/isNumber}}{{#isFlo
 // Deprecated
 {{/deprecated}}
 func (o *{{classname}}) Get{{name}}() *{{#isNumber}}float64{{/isNumber}}{{#isFloat}}float64{{/isFloat}}{{#isDouble}}float64{{/isDouble}}{{#isInteger}}int64{{/isInteger}}{{#isLong}}int64{{/isLong}}{{^isNumeric}}{{vendorExtensions.x-go-base-type}}{{/isNumeric}} {
-	if o == nil{{^isNullable}} || IsNil(o.{{name}}){{/isNullable}}{{#isNullable}}{{^vendorExtensions.x-golang-is-container}} || IsNil(o.{{name}}.Get()){{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
+	if o == nil || IsNil(o.{{name}}) {{#isNullable}}{{^vendorExtensions.x-golang-is-container}} || IsNil(o.{{name}}.Get()){{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
 		var ret *{{#isNumber}}float64{{/isNumber}}{{#isFloat}}float64{{/isFloat}}{{#isDouble}}float64{{/isDouble}}{{#isInteger}}int64{{/isInteger}}{{#isLong}}int64{{/isLong}}{{^isNumeric}}{{vendorExtensions.x-go-base-type}}{{/isNumeric}}
 		return ret
 	}
@@ -219,7 +222,7 @@ func (o *{{classname}}) Get{{name}}() *{{#isNumber}}float64{{/isNumber}}{{#isFlo
 // Deprecated
 {{/deprecated}}
 func (o *{{classname}}) Get{{name}}Ok() (*{{#isNumber}}float64{{/isNumber}}{{#isFloat}}float64{{/isFloat}}{{#isDouble}}float64{{/isDouble}}{{#isInteger}}int64{{/isInteger}}{{#isLong}}int64{{/isLong}}{{^isNumeric}}{{vendorExtensions.x-go-base-type}}{{/isNumeric}}, bool) {
-	if o == nil{{^isNullable}} || IsNil(o.{{name}}){{/isNullable}}{{#isNullable}}{{#vendorExtensions.x-golang-is-container}} || IsNil(o.{{name}}){{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
+	if o == nil || IsNil(o.{{name}}) {
 	{{^isFreeFormObject}}
 		return nil, false
 	{{/isFreeFormObject}}
@@ -242,7 +245,7 @@ func (o *{{classname}}) Get{{name}}Ok() (*{{#isNumber}}float64{{/isNumber}}{{#is
 
 // Has{{name}} returns a boolean if a field has been set.
 func (o *{{classname}}) Has{{name}}() bool {
-	if o != nil && {{^isNullable}}!IsNil(o.{{name}}){{/isNullable}}{{#isNullable}}{{#vendorExtensions.x-golang-is-container}}!IsNil(o.{{name}}){{/vendorExtensions.x-golang-is-container}}{{^vendorExtensions.x-golang-is-container}}o.{{name}}.IsSet(){{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
+	if o != nil && !IsNil(o.{{name}}) && !IsNil(o.{{name}}) {{#isNullable}}{{^vendorExtensions.x-golang-is-container}}&& o.{{name}}.IsSet(){{/vendorExtensions.x-golang-is-container}}{{/isNullable}} {
 		return true
 	}
 
@@ -259,6 +262,9 @@ func (o *{{classname}}) Set{{name}}(v *{{#isNumber}}float64{{/isNumber}}{{#isFlo
 	o.{{name}} = v
 {{/vendorExtensions.x-golang-is-container}}
 {{^vendorExtensions.x-golang-is-container}}
+	if IsNil(o.{{name}}) {
+		o.{{name}} = new({{dataType}})
+	}
 	o.{{name}}.Set(v)
 {{/vendorExtensions.x-golang-is-container}}
 {{/isNullable}}
@@ -270,11 +276,17 @@ func (o *{{classname}}) Set{{name}}(v *{{#isNumber}}float64{{/isNumber}}{{#isFlo
 {{^vendorExtensions.x-golang-is-container}}
 // Set{{name}}Nil sets the value for {{name}} to be an explicit nil
 func (o *{{classname}}) Set{{name}}Nil() {
+	if IsNil(o.{{name}}) {
+		o.{{name}} = new({{dataType}})
+	}
 	o.{{name}}.Set(nil)
 }
 
 // Unset{{name}} ensures that no value is present for {{name}}, not even an explicit nil
 func (o *{{classname}}) Unset{{name}}() {
+	if IsNil(o.{{name}}) {
+		o.{{name}} = new({{dataType}})
+	}
 	o.{{name}}.Unset()
 }
 {{/vendorExtensions.x-golang-is-container}}