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Reshuffle the updating of m_config in Realm::update_schema()

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This commit is contained in:
Thomas Goyne 2015-11-17 14:40:43 -08:00
parent 6c25eeb85c
commit 9c2d4703ed
1 changed files with 18 additions and 27 deletions
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43
src/shared_realm.cpp
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@ -232,42 +232,33 @@ bool Realm::update_schema(std::unique_ptr<Schema> schema, uint64_t version)
return update_schema(std::move(schema), version); return update_schema(std::move(schema), version);
} }
Config old_config(m_config);
auto migration_function = [&](Group*, Schema&) { auto migration_function = [&](Group*, Schema&) {
SharedRealm old_realm(new Realm(m_config)); SharedRealm old_realm(new Realm(old_config));
// Need to open in read-write mode so that it uses a SharedGroup, but
// users shouldn't actually be able to write via the old realm
old_realm->m_config.read_only = true; old_realm->m_config.read_only = true;
auto new_realm = shared_from_this(); if (m_config.migration_function) {
m_config.schema = std::move(schema); m_config.migration_function(old_realm, shared_from_this());
m_config.schema_version = version;
if (!m_config.migration_function) {
return;
}
try {
m_config.migration_function(old_realm, new_realm);
}
catch (...) {
m_config.schema = std::move(old_realm->m_config.schema);
m_config.schema_version = old_realm->m_config.schema_version;
throw;
} }
}; };
bool changed = ObjectStore::update_realm_with_schema(read_group(), *m_config.schema, try {
version, *schema,
migration_function);
commit_transaction();
if (schema) {
// We update the schema after opening the "old" Realm in the migration
// block to reduce the amount of juggling required, but that means that
// the schema hasn't been updated if no migration occurred
m_config.schema = std::move(schema); m_config.schema = std::move(schema);
m_config.schema_version = version; m_config.schema_version = version;
}
bool changed = ObjectStore::update_realm_with_schema(read_group(), *old_config.schema,
version, *m_config.schema,
migration_function);
commit_transaction();
return changed; return changed;
}
catch (...) {
m_config.schema = std::move(old_config.schema);
m_config.schema_version = old_config.schema_version;
throw;
}
} }
static void check_read_write(Realm *realm) static void check_read_write(Realm *realm)