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small fixes for v2 to v3 migration (#1016) (#1074)
* small fixes for v2 to v3 migration
* review comment
* Update v2-to-v3.md
* add store upgrade documentation
Co-authored-by: Carlos Rodriguez <[email protected]>
(cherry picked from commit a55ca88)
Co-authored-by: Carlos Rodriguez <[email protected]>
The host and controller submodule params only need to be set if you integrate those submodules.
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For example, if a chain chooses not to integrate a controller submodule, it does not need to set the controller params.
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#### Add `StoreUpgrades` for ICS27 module
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For ICS27 it is also necessary to [manually add store upgrades](https://docs.cosmos.network/v0.44/core/upgrade.html#add-storeupgrades-for-new-modules) for the new ICS27 module and then configure the store loader to apply those upgrades in `app.go`:
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```go
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if upgradeInfo.Name == "v3" && !app.UpgradeKeeper.IsSkipHeight(upgradeInfo.Height) {
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