Respackopts/run/resourcepacks/testpack/assets/minecraft/blockstates/spruce_fence.json

{
  "multipart": [
    {
      "apply": {
        "model": "minecraft:block/oak_fence_post"
      }
    },
    {
      "when": {
        "north": "true"
      },
      "apply": {
        "model": "minecraft:block/oak_fence_side"
      }
    },
    {
      "when": {
        "east": "true"
      },
      "apply": {
        "model": "minecraft:block/oak_fence_side"
      }
    },
    {
      "when": {
        "south": "true"
      },
      "apply": {
        "model": "minecraft:block/oak_fence_side"
      }
    },
    {
      "when": {
        "west": "true"
      },
      "apply": {
        "model": "minecraft:block/oak_fence_side"
      }
    }
  ]
}