lua - Inserting spawned objects into a group and removing the scene -

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i have 2 main questions based on code block below:

(1) in both spawning functions, scenegroup:insert() method returns nil though have named scenegroup , have inserted spawned objects new group. why nil value returned?

(2) when go next scene because player dies, how destroy current scene? i've tried obtaining current scene , removing way, hasn't worked. 

local function spawnobjects()     local bananas = display.newgroup()     scenegroup:insert(bananas)     bananas = display.newimagerect("object_bananas.png", 30, 20);     physics.addbody(bananas, "dynamic", {bounce = 0.3, radius = 9.5});     bananas.x = math.random(0, 320);     bananas.y = -40;     transition.to( bananas, {time = math.random(6000, 10000), x = math.random(10, 310)+1 , y = 600, });      -- function handle collision on bananas     function bananas:collision(e)         -- perform logic when bananas colliding monkey         if (e.other.class == "monkey")     updatescore()             -- cannot remove objects during collision, wait short moment end             timer.performwithdelay(100, function()                 -- remove bananas                 display.remove(self)             end, 1)         end         -- return true because have handled collision         return true     end     -- attach collision listener bananas     bananas:addeventlistener("collision",bananas)     return bananas  end local total_bananas = 15 tmr = timer.performwithdelay(2000, spawnobjects, total_bananas);   local function spawnobjects()     local coconut = display.newgroup()     scenegroup:insert(coconut)     coconut = display.newimagerect("coconut.png", 30, 35)     physics.addbody(coconut, "dynamic", {bounce = 0.5, radius = 11.5});     coconut.x = math.random(0, 320);     coconut.y = -40;     transition.to( coconut, {time = math.random(6000, 10000), x = math.random(10, 310) , y = 600, });      -- function handle collision on bananas     function coconut:collision(e)         -- perform logic when coconut colliding monkey         if (e.other.class == "monkey")             -- cannot remove objects during collision, wait short moment end             timer.performwithdelay(1, function()                 -- remove coconut                 display.remove(self)             end, 1)     composer.gotoscene("scene_gameover")     end          -- return true because have handled collision         return true     end      -- attach collision listener bananas     coconut:addeventlistener("collision", coconut)     return coconut end local total_coconut = 15 tmr = timer.performwithdelay(2000, spawnobjects, total_coconut);

forget scenegroup moment. scene object has display.newgroup() part of object. it's member known "view". is, "scene.view" group.

because can advanced things composer have multiple scenes in 1 group (not recommend it) scene's event functions scene:create() , such handled in object oriented manner. using colon operator (:) between scene , create, passing implicit parameter called "self" scene object triggered event. in cases self , scene same thing.

as convenience developers make local reference scene.view (self.view) inside event functions make easy use. if need access scene's view group outside of 1 of these event functions do:

scene.view:insert( displayobjectofyourchoice )

or localize own scenegroup variable:

local scenegroup = scene.view

and continue using scenegroup comfortable doing.

rob


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