docs: public String[] getLocalColumns(String modelName) {
  		List<String> columnList = new ArrayList<String>();
  		for(int i = 0; i < this.hasOne.length; i++){
  			if(modelName.equalsIgnoreCase(this.hasOne[i])){
  				columnList.add(hasOneLocalColumn[i]);
  			}
  		}
  		for(int j = 0; j < this.hasMany.length; j++){
  			if(modelName.equalsIgnoreCase(hasMany[j])){
  				columnList.add(hasManyLocalColumn[j]);
  			}
  		}
  		if(columnList.size() == 0){
  			return null;
  		}
  		return columnList.toArray(new String[columnList.size()]);
  	}