I make a chickpea and sweet potato curry too. Not sure I've ever made it with ALL of the ingredients, I just use what I have. It's a recipe from Super Food Ideas.

1 finely chopped onion
2 crushed garlic cloves
2 teaspoons grated ginger
1 tsp turmeric
3 tsp ground coriander
2 tsp ground cumin
1tsp chilli powder

400g can crushed tomatoes
500g kumara (orange sweet potato) (you can use pumpkin, I've used half kumara half potato before)
1 1/2 cups vegetable stock
2x 400g cans chickpeas (you could obviously just use the one)
1 bunch chopped spinach.

Heat oil in a large pan
Add your onion, then garlic and rest of spices for a bit of a spin in the pan.
Add tomatoes, kumara and stock, bring to the boil then reduce heat, partially cover and cook until kumara is tender (approx 25min)
Add chickpeas for about another 5 min
Add spinach just before you serve, just to wilt it.

I reckon you could do this with meat too, if you wanted. Don't know if you'd want to adapt this to a slow cooker then, to get the meat all tender.