Fixed ‘oneWay’ relation creating unnecessary attr

When ‘oneWay’ relation is created the target model file is also updated with a reference to the relation. This is not required for a oneWay relation since it never will or can be populated from the other way around.

packages/strapi-bookshelf/package.json

@@ -56,4 +56,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-ejs/package.json

@@ -46,4 +46,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-api/package.json

@@ -43,4 +43,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-controller/package.json

@@ -43,4 +43,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-model/package.json

@@ -43,4 +43,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-new/package.json

@@ -48,4 +48,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-plugin/package.json

@@ -44,4 +44,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-policy/package.json

@@ -43,4 +43,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-generate-service/package.json

@@ -43,4 +43,4 @@
     "npm": ">= 5.3.0"
   },
   "license": "MIT"
-}
+}

packages/strapi-plugin-content-type-builder/services/ContentTypeBuilder.js

@@ -201,6 +201,7 @@ module.exports = {
         };
 
         switch (relation.nature) {
+          case 'oneWay':
           case 'oneToOne':
           case 'manyToOne':
             attr.model = relation.target;
@@ -212,7 +213,9 @@ module.exports = {
           default:
         }
 
-        attr.via = relation.key;
+        if(relation.nature !== 'oneWay') {
+          attr.via = relation.key;
+        }
         attr.dominant = relation.dominant;
 
         if (_.trim(relation.pluginValue)) {
@@ -353,6 +356,8 @@ module.exports = {
             const attr = {};
 
             switch (params.nature) {
+              case 'oneWay':
+                return;
               case 'oneToOne':
               case 'oneToMany':
                 attr.model = model.toLowerCase();