saveImage.js

      saveImage(signedId){                                                                                               
        let image;                                                                                                       
        const finishSavingImage = (upload) => {                                                                          
          image = this.get('store').createRecord('image', { upload: upload });                                           
          this.set(image, 'file', signedId);                                                                             
          image.save().then(() => {                                                                                      
            upload.get('images').pushObject(image);                                                                      
            this.set('upload', upload);                                                                                  
          });                                                                                                            
        };                                                                                                               
        if(!this.get('upload')){                                                                                         
          const upload = this.store.createRecord('upload');                                                              
          upload.save().then(() => {                                                                                     
            finishSavingImage(upload);                                                                                   
          });                                                                                                            
        }else{                                                                                                           
          const upload = this.get('upload');                                                                             
          finishSavingImage(upload);                                                                                     
        }                                                                                                                
      }