{"record":{"id":"746eebdf6917ddfd","repo":"can1357/oh-my-pi","slug":"bank-newname-already-exists","errorCode":null,"errorMessage":"Bank '${newName}' already exists","messagePattern":"Bank '(.+?)' already exists","errorType":"exception","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"packages/mnemopi/src/core/banks.ts","lineNumber":75,"sourceCode":"\t\t}\n\t\treturn banks.sort();\n\t}\n\tbankExists(name: string): boolean {\n\t\tif (name === \"default\") return true;\n\t\treturn existsSync(join(this.banksDir, name));\n\t}\n\tgetBankDbPath(name: string): string {\n\t\tif (name.length === 0 || name === \"default\") return join(this.dataDir, DB_FILENAME);\n\t\tthis.validateName(name);\n\t\treturn join(this.banksDir, name, DB_FILENAME);\n\t}\n\trenameBank(oldName: string, newName: string): string {\n\t\tif (oldName === \"default\") throw new ValueError(\"Cannot rename 'default' bank\");\n\t\tthis.validateName(newName);\n\t\tconst oldDir = join(this.banksDir, oldName);\n\t\tconst newDir = join(this.banksDir, newName);\n\t\tif (!existsSync(oldDir)) throw new ValueError(`Bank '${oldName}' does not exist`);\n\t\tif (existsSync(newDir)) throw new ValueError(`Bank '${newName}' already exists`);\n\t\trenameSync(oldDir, newDir);\n\t\treturn join(newDir, DB_FILENAME);\n\t}\n\tgetBankStats(name: string): BankStats {\n\t\tconst dbPath = this.getBankDbPath(name);\n\t\tconst present = existsSync(dbPath);\n\t\tconst size = present ? statSync(dbPath).size : 0;\n\t\treturn { name, exists: present, db_path: dbPath, dbSizeBytes: size, db_size_bytes: size };\n\t}\n\tprivate validateName(name: string): void {\n\t\tif (name.length === 0) throw new ValueError(\"Bank name cannot be empty\");\n\t\tif (name === \"default\") return;\n\t\tif (name.length > 64) throw new ValueError(`Bank name '${name}' exceeds 64 characters`);\n\t\tfor (let i = 0; i < name.length; i++) {\n\t\t\tconst code = name.charCodeAt(i);\n\t\t\tconst ok =\n\t\t\t\t(code >= 48 && code <= 57) ||\n\t\t\t\t(code >= 65 && code <= 90) ||","sourceCodeStart":57,"sourceCodeEnd":93,"githubUrl":"https://github.com/can1357/oh-my-pi/blob/969062200754ea02cfac922e5ebb8c608c079e15/packages/mnemopi/src/core/banks.ts#L57-L93","documentation":"`renameBank()` refuses to rename onto an existing bank: if a directory for `newName` already exists under `banks/`, the rename would overwrite another bank's database, so it fails fast.","triggerScenarios":"Calling `renameBank(oldName, newName)` where `<dataDir>/banks/<newName>/` exists — target name collides with an existing bank.","commonSituations":"Rename loops that pick names already in use, renaming to a name auto-derived from a project that has its own bank, retried scripts after a partial previous run.","solutions":["Pick a unique `newName` (check `listBanks()`/`getBankStats(newName).exists` first).","Delete or rename away the existing target bank first if it is disposable.","Append a suffix to guarantee uniqueness.","Catch the ValueError and choose a different target name."],"exampleFix":"// before\nbanks.renameBank(\"tmp\", \"work\");\n// after\nlet target = \"work\";\nwhile (banks.getBankStats(target).exists) target = `work-${Date.now()}`;\nbanks.renameBank(\"tmp\", target);","handlingStrategy":"validation","validationCode":"if (banks.getBankStats(newName).exists) {\n  throw new Error(`Target bank '${newName}' already exists`);\n}","typeGuard":"null","tryCatchPattern":"try {\n  banks.renameBank(oldName, newName);\n} catch (err) {\n  if (err instanceof ValueError && err.message.includes(\"already exists\")) {\n    newName = `${newName}-${Date.now()}`;\n    banks.renameBank(oldName, newName);\n  } else throw err;\n}","preventionTips":["Check the target name before renaming.","Generate unique target names (suffix with timestamp/counter).","Avoid re-running partial rename scripts without cleanup.","List banks first and assert the target is free."],"tags":["bank","rename","conflict","already-exists"],"backgroundTag":"resource-already-exists","analyzedSha":"969062200754ea02cfac922e5ebb8c608c079e15","analyzedAt":"2026-08-31T10:29:35.737Z","schemaVersion":2},"datasetVersion":"2026-08-31T14:17:45.589Z"}