right. you've got your invincible fort and all your items are safe. but raiders have destroyed your farm!
Luckily I have an answer for that! (what would you do without me)
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To get your melon just do this. get some grass and place it like in the picture with some water next to it.
then add a redstone block/redstone torch (anything that'll give off a redstone signal) connect a repeater to it.
add hoppers along the sides to collect the melon. (also make it so the repeater is on top of a hopper) and add a piston like so. make sure that the melon can only be placed on the grass block. then if you've built it correctly you'll have melon for days! Thanks for reading!