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7 changes: 5 additions & 2 deletions packages/compass-data-modeling/src/store/diagram.ts
Original file line number Diff line number Diff line change
Expand Up @@ -94,11 +94,14 @@ export const diagramReducer: Reducer<DiagramState> = (
action
) => {
if (isAction(action, DiagramActionTypes.OPEN_DIAGRAM)) {
const current = action.diagram.edits;
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Copilot AI Jul 11, 2025

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This logic creates an array of progressively longer slices but could be clearer. Consider adding a comment explaining that this reconstructs the edit history states for undo functionality.

Suggested change
const current = action.diagram.edits;
const current = action.diagram.edits;
// Reconstruct the edit history states for undo functionality by creating an array of progressively longer slices of the `current` edits array.

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const prev = current.map((_item, index, arr) => arr.slice(0, index + 1));
prev.shift(); // Remove the first item, which is initial SetModel and there's no previous edit for it.
return {
...action.diagram,
edits: {
prev: [],
current: action.diagram.edits,
prev,
current,
next: [],
},
};
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48 changes: 48 additions & 0 deletions packages/compass-e2e-tests/tests/data-modeling-tab.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,54 @@ describe('Data Modeling tab', function () {
.waitForDisplayed({ reverse: true });
});

it('allows undo after opening a diagram', async function () {
const dataModelName = 'Test Data Model - Undo After Open';
await setupDiagram(browser, {
diagramName: dataModelName,
connectionName: DEFAULT_CONNECTION_NAME_1,
databaseName: 'test',
});

const dataModelEditor = browser.$(Selectors.DataModelEditor);
await dataModelEditor.waitForDisplayed();

const testCollection1 = browser.$(
Selectors.DataModelPreviewCollection('test.testCollection-one')
);
const startPosition = await testCollection1.getLocation();
const nodeSize = await testCollection1.getSize();

await browser
.action('pointer')
.move({
x: Math.round(startPosition.x + nodeSize.width / 2),
y: Math.round(startPosition.y + nodeSize.height / 2),
})
.down({ button: 0 }) // Left mouse button
.move({ x: 100, y: 0, duration: 1000, origin: 'pointer' })
.pause(1000)
.move({ x: 100, y: 0, duration: 1000, origin: 'pointer' })
.up({ button: 0 }) // Release the left mouse button
.perform();
await browser.waitForAnimations(dataModelEditor);

// Open the saved diagram in new tab
await browser.openNewTab();
await browser.clickVisible(Selectors.DataModelsListItem(dataModelName));
await browser.$(Selectors.DataModelEditor).waitForDisplayed();

// Ensure that undo button is enabled
await browser.waitForAriaDisabled(Selectors.DataModelUndoButton, false);

// Undo the change
await browser.clickVisible(Selectors.DataModelUndoButton);
await browser.waitForAnimations(dataModelEditor);

// Ensure that undo button is now disabled and redo is enabled
await browser.waitForAriaDisabled(Selectors.DataModelUndoButton, true);
await browser.waitForAriaDisabled(Selectors.DataModelRedoButton, false);
});

it('exports the data model to JSON', async function () {
const dataModelName = 'Test Export Model - JSON';
exportFileName = `${dataModelName}.json`;
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