Cake

[lavish notch]

I created a texture for a cake. Its not working. Its purple and black. And if i place the cake it forgets his custom model data and becomes a normal cake

{
  "parent": "minecraft:item/generated",
  "textures": {
    "layer0": "minecraft:item/cake"
  },
    "overrides": [
        {"predicate": {"custom_model_data": 50012}, "model": "item/cake/first_anniversary_cake"}
    ]
}

[frozen canyon]

The latter is normal

CustomModelData ONLY works for items, never for blocks.

Its not working. Its purple and black.
assuming you are talking about your custom one, is it a purple/black cube or purple/black plane?

[lavish notch]

How do i override the block?

[lavish notch]

cube

[frozen canyon]

If you just wanna replace all cakes you name your custom model cake.json and put that in models/block
There is no way to have normal cake and a custom cake. Though I guess you could replace candle_cake specifically

[frozen canyon]

Then your model either isn't where your specified or your model itself has a syntax error (like having capital or spaces in its texture paths, some invalid parent, invalid rotations etc.)