make key converters static

Author: jannishuebl

src/model.ts

@@ -468,7 +468,7 @@ export class JSORMBase {
         let attributeName = key
 
         if (this.klass.camelizeKeys) {
-          attributeName = this.deserializeKey(key)
+          attributeName = this.klass.deserializeKey(key)
         }
 
         if (key === "id" || this.klass.attributeList[attributeName]) {
@@ -694,6 +694,17 @@ export class JSORMBase {
     return this.baseClass
   }
 
+  static serializeKey(key: string): string {
+    if (this.letterCase == "dasherized") {
+      return dasherize(underscore(key))
+    }
+    return underscore(key)
+  }
+
+  static deserializeKey(key: string): string {
+    return camelize(underscore(key), false)
+  }
+
   async destroy(): Promise<boolean> {
     const url = this.klass.url(this.id)
     const verb = "delete"
@@ -741,17 +752,6 @@ export class JSORMBase {
     })
   }
 
-  serializeKey(key: string): string {
-    if (this.klass.letterCase == "dasherized") {
-      return dasherize(underscore(key))
-    }
-    return underscore(key)
-  }
-
-  deserializeKey(key: string): string {
-    return camelize(underscore(key), false)
-  }
-
   private async _handleResponse(
     response: JsonapiResponse,
     callback: () => void

src/util/validation-errors.ts

@@ -43,7 +43,7 @@ export class ValidationErrors {
     let attribute = meta.attribute
 
     if (this.model.klass.camelizeKeys) {
-      attribute = this.model.deserializeKey(attribute)
+      attribute = this.model.klass.deserializeKey(attribute)
     }
 
     errorsAccumulator[attribute] = meta.message

src/util/write-payload.ts

@@ -33,7 +33,7 @@ export class WritePayload<T extends JSORMBase> {
 
     this._eachAttribute((key, value) => {
       if (!this.model.isPersisted || this.model.changes()[key]) {
-        attrs[this.model.serializeKey(key)] = value
+        attrs[this.model.klass.serializeKey(key)] = value
       }
     })
 
@@ -120,7 +120,7 @@ export class WritePayload<T extends JSORMBase> {
         }
 
         if (data) {
-          _relationships[this.model.serializeKey(key)] = { data }
+          _relationships[this.model.klass.serializeKey(key)] = { data }
         }
       }
     })