resolving migration error - #80
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WalkthroughWrangler now runs ChangesWrangler build configuration
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🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@wrangler.toml`:
- Around line 59-60: Update the [build].command configuration so remote D1
migrations run only when WRANGLER_COMMAND indicates deploy, while preserving
local development without migration. In the deploy path, require
CLOUDFLARE_API_TOKEN and fail when it is missing; continue the build command
without remote migration for other Wrangler commands.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (1)
wrangler.toml
| [build] | ||
| command = "bash migrate.sh" |
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🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win
🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
echo "== files =="
git ls-files | rg '(^|/)(wrangler\.toml|migrate\.sh|package\.json)$' || true
echo "== wrangler relevant =="
if [ -f wrangler.toml ]; then
nl -ba wrangler.toml | sed -n '1,120p'
fi
echo "== migrate =="
if [ -f migrate.sh ]; then
nl -ba migrate.sh | sed -n '1,220p'
fi
echo "== other occurrences =="
rg -n "WRANGLER_COMMAND|migrate\.sh|education_db|CLOUDFLARE_API_TOKEN|wrangler" -S . --glob '!node_modules' --glob '!dist' --glob '!build' || trueRepository: alphaonelabs/learn
Length of output: 257
🏁 Script executed:
#!/bin/bash
set -euo pipefail
echo "== locate files =="
printf '%s\n' "migrate.sh" "wrangler.toml"
echo "== wrangler.toml lines =="
awk '{printf "%6d %s\n", NR, $0}' wrangler.toml | sed -n '1,120p'
echo "== migrate.sh lines =="
awk '{printf "%6d %s\n", NR, $0}' migrate.sh | sed -n '1,220p'
echo "== relevant occurrences =="
grep -RInE "WRANGLER_COMMAND|migrate\.sh|education_db|CLOUDFLARE_API_TOKEN|wrangler|build|command" . --exclude-dir=node_modules --exclude-dir=dist --exclude-dir=build || trueRepository: alphaonelabs/learn
Length of output: 25007
🌐 Web query:
Cloudflare Wrangler custom builds command runs during wrangler dev and deploy WRANGLER_COMMAND
💡 Result:
In Cloudflare Wrangler, you can define a custom build process by adding a [build] section to your wrangler.toml (or wrangler.jsonc) configuration file [1][2][3]. When configured, this custom build command executes as part of the wrangler dev, wrangler deploy, and other lifecycle commands [1][4][3]. To differentiate the execution context within your build script, Wrangler provides the WRANGLER_COMMAND environment variable [1][4]. When your custom build command runs, this variable is automatically set by Wrangler, allowing you to trigger different logic (e.g., development vs. production builds) based on which command initiated the process [1][3]. The possible values for WRANGLER_COMMAND include: - dev: Triggered by wrangler dev [1][3] - deploy: Triggered by wrangler deploy [1][3] - versions upload: Triggered by wrangler versions upload [1][3] - types: Triggered by wrangler types [1][3] Example usage in a shell script: #!/bin/bash if [ "$WRANGLER_COMMAND" = "dev" ]; then echo "Building for development..." # run development build commands else echo "Building for production..." # run production build commands fi Configuration Options: - command (string): The command to run to build your Worker. On Linux and macOS, it executes in sh; on Windows, it uses cmd [1][3]. - cwd (string, optional): The directory where the command is executed [1][3]. - watch_dir (string | string[], optional): The directory or directories to monitor for changes during wrangler dev, which will re-trigger the custom build [1][3].
Citations:
- 1: https://developers.cloudflare.com/workers/wrangler/custom-builds/
- 2: https://developers.cloudflare.com/workers/wrangler/configuration/
- 3: https://developers.cloudflare.com/workers/wrangler/custom-builds/index.md
- 4: [wrangler] Add WRANGLER_COMMAND environment variable to custom build commands cloudflare/workers-sdk#12470
Run remote D1 migrations only for deployments.
[build].command applies during both wrangler dev and wrangler deploy, so a local session with CLOUDFLARE_API_TOKEN can change the remote education_db. Use WRANGLER_COMMAND to run remote migrations only when Wrangler invokes deploy, and fail the build if credentials are missing in that path.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@wrangler.toml` around lines 59 - 60, Update the [build].command configuration
so remote D1 migrations run only when WRANGLER_COMMAND indicates deploy, while
preserving local development without migration. In the deploy path, require
CLOUDFLARE_API_TOKEN and fail when it is missing; continue the build command
without remote migration for other Wrangler commands.
So that production deploys automatically apply all migration files
Summary
[build]configuration to runbash migrate.shduring production deployment.