How to remove or change recipe unlock in technology?

[Keysivi]

Good afternoon

There is a code for adding unlocking a recipe when researching a technology:

Code: Select all

if data.raw["technology"]["military-4"] then
table.insert(data.raw["technology"]["military-4"].effects, {type = "unlock-recipe",recipe = "dragons-breath-shotgun-shell"})
end

But I don't have enough knowledge to prescribe a similar code to remove vanilla recipe unlock from researched technology? Or replacing the vanilla recipe with another?

Something like this:

Code: Select all

if data.raw["technology"]["military-4"] then
 table.remove( ..., {type = "unlock-recipe",recipe = "piercing-shotgun-shell"})
end

Or:

Code: Select all

if data.raw["technology"]["military-4"] then
 table.replace( ... , {type = "unlock-recipe",recipe = "piercing-shotgun-shell"} to {type = "unlock-recipe",recipe = "dragons-breath-shotgun-shell"}) 
 end
 

Sorry for the bad syntax...

I would be very grateful for your help!

[Pi-C]

Good afternoon

There is a code for adding unlocking a recipe when researching a technology:

Code: Select all

if data.raw["technology"]["military-4"] then
table.insert(data.raw["technology"]["military-4"].effects, {type = "unlock-recipe",recipe = "dragons-breath-shotgun-shell"})
end

Basically, this code is the equivalent of

Code: Select all

if data.raw["technology"]["military-4"] then
    local last_entry = #data.raw["technology"]["military-4"].effects
    data.raw["technology"]["military-4"].effects[last_entry + 1] =  { type = "unlock-recipe",recipe = "dragons-breath-shotgun-shell" }
end

This means that data.raw["technology"]["military-4"].effects is an array where the elements are indexed by consecutive numbers (i.e. 1, 2, 3, …, last_entry). If given without a position parameter, table.insert(array, new_element) will attach new_element directly to the end of array.

But I don't have enough knowledge to prescribe a similar code to remove vanilla recipe unlock from researched technology? Or replacing the vanilla recipe with another?

In order to manipulate an element in such an array, you must know the element's position within the array. You won't know the position because even if you try to change the effects of a vanilla technology, there may be other mods that have added/removed/replaced effects of this technology before your mod could act. So in order to remove or replace an element in the array of tech effects, you must find its position:

Code: Select all

local tech = data.raw["technology"]["military-4"]
if tech then
  local position

  for e, effect in ipairs(tech.effects) do
    if effect.type == "unlock-recipe" and effect.recipe = "piercing-shotgun-shell" then
    	position = e
    	break
    end
  end    
  
  -- Code to remove or change the element goes here
end

Now that you've found the position of your unlock-recipe in the array of technology effects, you can remove the effect:

Code: Select all

 table.remove(tech.effects, position)

or replace it:

Code: Select all

  tech.effects[position] = {type = "unlock-recipe", recipe = "dragons-breath-shotgun-shell"}

[Keysivi]

Pi-C - thank you very much!

[Keysivi]

Unfortunately something is wrong with your code.

Shows a syntax error:

2.237 Mods to disable:Не удалось загрузить следующие моды: __My_add_pack__/prototype/dragons-breath-shotgun-pellet.lua:4: ..._/prototype/dragons-breath-shotgun-pellet/technology.lua:6: 'then' expected near '='
stack traceback:
[C]: in function 'require'
__My_add_pack__/prototype/dragons-breath-shotgun-pellet.lua:4: in main chunk
[C]: in function 'require'
__My_add_pack__/data.lua:18: in main chunk

lua:6

Code: Select all

     if effect.type == "unlock-recipe" and effect.recipe = "piercing-shotgun-shell" then

[Keysivi]

I seem to have found an error:

You have it written like this:

Code: Select all

if effect.type == "unlock-recipe" and effect.recipe = "piercing-shotgun-shell" then

And I added a second '='

Code: Select all

if effect.type == "unlock-recipe" and effect.recipe == "piercing-shotgun-shell" then

It seems to have worked.

Was it the right decision?

[Pi-C]

I seem to have found an error:

You have it written like this:

Code: Select all

if effect.type == "unlock-recipe" and effect.recipe = "piercing-shotgun-shell" then

And I added a second '='

Was it the right decision?

Sorry for the typo! You handled this correctly. In the if-clause of an if-then-statement, you only want comparisons (x == y), assignments (=) can only be used after "then".

[Keysivi]

I understood you. Thanks a lot for the tips! You helped me a lot!