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fix: relationship label to be optional in ER diagram syntax

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on-behalf-of: @Mermaid-Chart <hello@mermaidchart.com>
This commit is contained in:
darshanr0107
2025-08-20 18:36:45 +05:30
parent 7171237b96
commit 299226f8c2
3 changed files with 44 additions and 8 deletions
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12
cypress/integration/rendering/erDiagram.spec.js
View File

@@ -322,6 +322,18 @@ ORDER ||--|{ LINE-ITEM : contains
);
});
it('should render an ER diagram without labels also', () => {
imgSnapshotTest(
`
erDiagram
BOOK }|..|{ AUTHOR
BOOK }|..|{ GENRE
AUTHOR }|..|{ GENRE
`,
{ logLevel: 1 }
);
});
it('should render relationship labels with line breaks', () => {
imgSnapshotTest(
`

34
packages/mermaid/src/diagrams/er/parser/erDiagram.jison
View File

@@ -94,6 +94,22 @@ start
: 'ER_DIAGRAM' document 'EOF' { /*console.log('finished parsing');*/ }
;
relationship
: ENTITY relationType ENTITY maybeRole
{
yy.addRelationship($1, $4, $3, $2);
};
maybeRole
: COLON role
{
$$ = $2;
}
| /* empty */
{
$$ = '';
};
document
: /* empty */ { $$ = [] }
| document line {$1.push($2);$$ = $1}
@@ -108,32 +124,34 @@ line
statement
: entityName relSpec entityName COLON role
: entityName relSpec entityName maybeRole
{
yy.addEntity($1);
yy.addEntity($3);
yy.addRelationship($1, $5, $3, $2);
yy.addRelationship($1, $4, $3, $2);
}
| entityName STYLE_SEPARATOR idList relSpec entityName STYLE_SEPARATOR idList COLON role
| entityName STYLE_SEPARATOR idList relSpec entityName STYLE_SEPARATOR idList maybeRole
{
yy.addEntity($1);
yy.addEntity($5);
yy.addRelationship($1, $9, $5, $4);
yy.addRelationship($1, $8, $5, $4);
yy.setClass([$1], $3);
yy.setClass([$5], $7);
}
| entityName STYLE_SEPARATOR idList relSpec entityName COLON role
| entityName STYLE_SEPARATOR idList relSpec entityName maybeRole
{
yy.addEntity($1);
yy.addEntity($5);
yy.addRelationship($1, $7, $5, $4);
yy.addRelationship($1, $6, $5, $4);
yy.setClass([$1], $3);
}
| entityName relSpec entityName STYLE_SEPARATOR idList COLON role
| entityName relSpec entityName STYLE_SEPARATOR idList maybeRole
{
yy.addEntity($1);
yy.addEntity($3);
yy.addRelationship($1, $7, $3, $2);
yy.addRelationship($1, $6, $3, $2);
yy.setClass([$3], $5);
}
| entityName BLOCK_START attributes BLOCK_STOP

6
packages/mermaid/src/diagrams/er/parser/erDiagram.spec.js
View File

@@ -981,6 +981,12 @@ describe('when parsing ER diagram it...', function () {
expect(rels[0].roleA).toBe('places');
});
it('should allow label as optional', function () {
erDiagram.parser.parse('erDiagram\nCUSTOMER ||--|{ ORDER');
const rels = erDb.getRelationships();
expect(rels[0].roleA).toBe('');
});
it('should represent parent-child relationship correctly', function () {
erDiagram.parser.parse('erDiagram\nPROJECT u--o{ TEAM_MEMBER : "parent"');
const rels = erDb.getRelationships();