Hi Anda_skoa,

Thank you for your response. Below is the code. I think the problem is with self.join_model.insertRow(join_row). I only want to insert a row if the previous row was successfully added to the model. If the user keeps hitting the addrow button, then a row is added to the view, but not the model. This is because I am using a QSqlRelationalTableModel and ingredient cannot be null, therefore, if the user keeps hitting addrow then a row is added to the view, but not the model. How do you prevent a row from being added to the view if it is not added to the model first. This does not break anything it just looks bad. One option that I have thought of is reinstantiate the model class every time a row is added. While this will fix the problem this does not seem like a good approach.



Qt Code: 
  1. def AddJoinRow(self):
  2.         """this will allow one to add a row into the bottom model.
  3.         This tool is a many to many relationship between recipes and ingrendents.
  4.         Ingredients our popluated by the program. This is a many to many relationship.
  5.         This two tool has to models and two views the top model handles the recipes and the bottom model handles the ingredients.
  6.         """
  7.         ## recipe row count
  8.         recipe_count = self.obj_model.rowCount()
  9.         ## this is to test if there is at least one planning ID.
  10.         if recipe_count == 0:
  11.             msg = "you must add a recipe before you can add a row to the join table."
  12.             QtGui.QMessageBox.warning(self, "warning", msg, QtGui.QMessageBox.Ok)
  13.             return
  14.         ## else there is at least one row in the recipe model.
  15.         else:
  16.             ## get the selected row in the recipe table.
  17.             selected_index = self.obj_tableView.currentIndex()
  18.             ## this tests if there is not a selected index in the recipe model.
  19.             if not selected_index.isValid():
  20.                 msg = "you must select a recipe row before adding a row in the "
  21.                 QtGui.QMessageBox.warning(self, "warning", msg, QtGui.QMessageBox.Ok)
  22.                 return
  23.             ## else there is a selected index in the planning objective model.
  24.             else:
  25.                 ## get the row index of the selected recipe
  26.                 row_index = selected_index.row()
  27.                 max_id = 1
  28.                 query = QtSql.QSqlQuery()
  29.                 ##Query the join database table to get the max id
  30.                 query.exec_("SELECT MAX(id) FROM join_recipe_ingredents")
  31.                 if query.next():
  32.                     max_id = query.value(0).toInt()[0]
  33.  
  34.                 ## query the recipe model to get the recipe id from the top model.
  35.                 ## cannot use rowcount because a user can remove a row.
  36.                 recipe_id = self.obj_model.data(self.obj_model.index(row_index, ID)).toInt()[0]
  37.  
  38.                 ## get the row count of the join table.
  39.                 join_row = self.join_model.rowCount()
  40.                 ## insert a row into the model.
  41.                 self.join_model.insertRow(join_row)
  42.                 ## set column 1 value to be the max id + 1
  43.                 self.join_model.setData(self.join_model.index(join_row, JOIN_ID), max_id + 1)
  44.                 ## set column 2 value to be the recipe_id
  45.                 self.join_model.setData(self.join_model.index(join_row, PLANNING_ID), recipe_id)
  46.                 ## column 3 is a combo box of all the ingrendents. I am using setRelation to populate this combobox.
  47.  
  48.                 ## get the index of the newly added row.
  49.                 index = self.join_model.index(join_row, CFR_ID)
  50.                 if index.isValid():
  51.                     ## set it to editing.
  52.                     self.join_tableView.edit(index)
  53.                 else:
  54.                     msg = "row was not inserted because you need to change row to a unique vaule."
  55.                     QtGui.QMessageBox.warning(self, "warning", msg, QtGui.QMessageBox.Ok)
  56.                 self.resizeRow()
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