# PATCH /api/v1/dashboards/models/drafts/{draft_id}

> Edit a proposed model before building it

- **Tag:** dashboards
- **Operation ID:** `revise_model_draft_api_v1_dashboards_models_drafts__draft_id__patch`

## Description

Change the period axis or an assumption value on a draft and get the re-planned model back — re-resolved against the chart of accounts and re-evaluated, so the effect of the edit is visible before anything is built.

This exists so the common edits — *quarterly not monthly*, *the fee is 55 basis points* — do not have to go back through the language model, which would re-emit every row and is free to drift a formula nobody asked about. Structural changes still belong in chat.

`assumptions` is merged into the draft; sending one key does not delete the others. The edit keeps the same `draft_id` and renews its expiry. An edit that would make the model invalid — dropping an assumption a row still references, or an axis wider than the column cap — is rejected here with the reason, not at build time.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `draft_id` (path, string, required)

## Request body

Schema: `ReviseDraftRequest`

- `title` (string)
- `assumptions` (object)
- `grain` (string)
- `start` (string · date)
- `end` (string · date)

## Responses

### 200 — Successful Response

Schema: `SuccessEnvelope_ModelPlanResponse_`

- `success` (boolean)
- `message` (string)
- `code` (string)
- `data` (ModelPlanResponse)

### 400 — Bad Request - Invalid input

### 401 — Unauthorized - Authentication required

### 403 — Forbidden - Insufficient permissions

### 404 — Not Found - Resource does not exist

### 422 — Validation Error

Schema: `HTTPValidationError`

- `detail` (array · ValidationError) → `ValidationError`
  - `loc` (array · string | integer · required)
  - `msg` (string · required)
  - `type` (string · required)
  - `input` (object)
  - `ctx` (object)

## Code samples

### cURL

```bash
curl -X PATCH 'https://api.ondayzero.com/api/v1/dashboards/models/drafts/{draft_id}' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "title": "string",
  "assumptions": {},
  "grain": "string",
  "start": "2026-01-01",
  "end": "2026-01-01"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/dashboards/models/drafts/{draft_id}', {
  method: 'PATCH',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "title": "string",
  "assumptions": {},
  "grain": "string",
  "start": "2026-01-01",
  "end": "2026-01-01"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {
  "title": "string",
  "assumptions": {},
  "grain": "string",
  "start": "2026-01-01",
  "end": "2026-01-01"
}

response = httpx.patch("https://api.ondayzero.com/api/v1/dashboards/models/drafts/{draft_id}", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/dashboards/revise-model-draft
- OpenAPI slice: https://www.ondayzero.com/docs/reference/dashboards/revise-model-draft/openapi.json
- Other endpoints in **dashboards**: https://www.ondayzero.com/docs/reference/dashboards