Possible bug? Column prop on Perspective table not being populated properly

In order to make a dynamically changing CRUD view I’ve been trying to make columns editable dynamically.
I’ve managed to dynamically fill the columns prop, but I’m running into a strange issue. Even though I make sure my list/array filled with my modified JSON objects contain the correct values, it populates the columns prop with however many of the exact same JSON object, effectively only showing one of my columns, always the last.
Here is my code in case anyone spots something obvious:

	import json
	#clear the columns prop
	self.getSibling("Table").props.columns = []
	#get the table name from the custom prop on the root
	tableName = self.parent.custom.tableName
	#construct and fire a query to return the columns in the table.
	columnNames = system.db.runPrepQuery(queryGetColumns)
	#construct and fire a query to return the column with identity
	queryGetUnique ="SELECT name FROM sys.identity_columns WHERE OBJECT_NAME(object_id) = ?;"
	argList = [tableName]
	uniqueColumn = system.db.runScalarPrepQuery(queryGetUnique, argList)
	print 'unique = '+uniqueColumn
	#make an array/list to fill with JSON objects
	propsColumns = []
	#load in the JSON format for columns prop
	columnJSON = json.loads(self.getSibling("Table").custom.columnFormat)
	i = 0
	#for every column fill propsColumns with a JSON object
	for row in columnNames:
		for column in row:
			propsColumns[i]['field'] = column
			#if the column ins't the identity column make it editable
			if column != uniqueColumn:
				propsColumns[i]['editable'] = bool(1)
				propsColumns[i]['editable'] = bool(0)
			print propsColumns[i]['field']
			print propsColumns[i]['editable']
			#counter + 1
			i = i+1
	#populate columns prop
	self.getSibling("Table").props.columns = propsColumns

Does anyone have an idea what might be causing this or is this simply a bug?

You are re-using your columnJSON object, making every column that object. You need to clone that, modify the clone, and append the clone.