I play Hexblade warlocks a lot. I, of course, usually take Pact of the Blade to go with it. It says you can only summon melee weapons. Do Hexblades ignore this rule? Would I be able to summon a longbow as as my pact weapon with Pact of the Blade?
No, but there are ways to get a longbow
Hexblade warlocks do not get to simply ignore this rule, as nothing in their description says they can. However, the Eldritch Invocation Improved Pact Weapon includes this:
Finally, the weapon you conjure can be a shortbow, longbow, light crossbow, or heavy crossbow.
So, even though simply being a Hexblade Warlock does not allow this, this Eldritch Invocation does
There is also a way other than that though. The pact of the blade includes:
You can transform one magic weapon into your pact weapon by performing a special ritual while you hold the weapon
So, if you can find a magical longbow, you can make it into your pact weapon, even without the improved pact weapon invocation