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import graphviz
import json
from tempfile import NamedTemporaryFile
import os
def generate_entity_relationship_diagram(json_input: str, output_format: str) -> str:
"""
Generates an entity relationship diagram from JSON input.
Args:
json_input (str): A JSON string describing the entity relationship diagram structure.
It must follow the Expected JSON Format Example below.
Expected JSON Format Example:
{
"entities": [
{
"name": "Customer",
"type": "strong",
"attributes": [
{"name": "customer_id", "type": "primary_key"},
{"name": "first_name", "type": "regular"},
{"name": "last_name", "type": "regular"},
{"name": "email", "type": "regular"},
{"name": "phone", "type": "multivalued", "multivalued": true},
{"name": "age", "type": "derived", "derived": true},
{"name": "address", "type": "composite", "composite": true}
]
},
{
"name": "Order",
"type": "strong",
"attributes": [
{"name": "order_id", "type": "primary_key"},
{"name": "customer_id", "type": "foreign_key"},
{"name": "order_date", "type": "regular"},
{"name": "total_amount", "type": "regular"},
{"name": "status", "type": "regular"},
{"name": "shipping_address", "type": "composite", "composite": true}
]
},
{
"name": "Product",
"type": "strong",
"attributes": [
{"name": "product_id", "type": "primary_key"},
{"name": "name", "type": "regular"},
{"name": "description", "type": "regular"},
{"name": "price", "type": "regular"},
{"name": "category_id", "type": "foreign_key"},
{"name": "stock_quantity", "type": "regular"}
]
},
{
"name": "Category",
"type": "strong",
"attributes": [
{"name": "category_id", "type": "primary_key"},
{"name": "name", "type": "regular"},
{"name": "description", "type": "regular"},
{"name": "parent_category_id", "type": "foreign_key"}
]
},
{
"name": "OrderItem",
"type": "weak",
"attributes": [
{"name": "order_id", "type": "primary_key"},
{"name": "product_id", "type": "primary_key"},
{"name": "quantity", "type": "regular"},
{"name": "unit_price", "type": "regular"},
{"name": "discount", "type": "regular"}
]
},
{
"name": "Payment",
"type": "strong",
"attributes": [
{"name": "payment_id", "type": "primary_key"},
{"name": "order_id", "type": "foreign_key"},
{"name": "payment_method", "type": "regular"},
{"name": "amount", "type": "regular"},
{"name": "payment_date", "type": "regular"},
{"name": "transaction_id", "type": "regular"}
]
},
{
"name": "Supplier",
"type": "strong",
"attributes": [
{"name": "supplier_id", "type": "primary_key"},
{"name": "company_name", "type": "regular"},
{"name": "contact_person", "type": "regular"},
{"name": "email", "type": "regular"},
{"name": "phone", "type": "multivalued", "multivalued": true},
{"name": "address", "type": "composite", "composite": true}
]
},
{
"name": "Review",
"type": "weak",
"attributes": [
{"name": "customer_id", "type": "primary_key"},
{"name": "product_id", "type": "primary_key"},
{"name": "rating", "type": "regular"},
{"name": "comment", "type": "regular"},
{"name": "review_date", "type": "regular"}
]
}
],
"relationships": [
{
"name": "Places",
"type": "regular",
"entities": ["Customer", "Order"],
"cardinalities": {
"Customer": "1",
"Order": "N"
}
},
{
"name": "Contains",
"type": "identifying",
"entities": ["Order", "OrderItem"],
"cardinalities": {
"Order": "1",
"OrderItem": "N"
}
},
{
"name": "Includes",
"type": "regular",
"entities": ["OrderItem", "Product"],
"cardinalities": {
"OrderItem": "N",
"Product": "1"
}
},
{
"name": "BelongsTo",
"type": "regular",
"entities": ["Product", "Category"],
"cardinalities": {
"Product": "N",
"Category": "1"
}
},
{
"name": "ProcessedBy",
"type": "regular",
"entities": ["Order", "Payment"],
"cardinalities": {
"Order": "1",
"Payment": "1"
}
},
{
"name": "Supplies",
"type": "regular",
"entities": ["Supplier", "Product"],
"cardinalities": {
"Supplier": "N",
"Product": "M"
}
},
{
"name": "Writes",
"type": "weak",
"entities": ["Customer", "Review"],
"cardinalities": {
"Customer": "1",
"Review": "N"
}
},
{
"name": "ReviewsProduct",
"type": "weak",
"entities": ["Review", "Product"],
"cardinalities": {
"Review": "N",
"Product": "1"
}
},
{
"name": "Subcategory",
"type": "regular",
"entities": ["Category", "Category"],
"cardinalities": {
"Category": "1",
"Category": "N"
}
}
]
}
Returns:
str: The filepath to the generated PNG image file.
"""
try:
if not json_input.strip():
return "Error: Empty input"
data = json.loads(json_input)
if 'entities' not in data:
raise ValueError("Missing required field: entities")
dot = graphviz.Graph(comment='ER Diagram', engine='dot')
dot.attr(rankdir='TB', bgcolor='white', pad='0.5')
dot.attr('node', fontname='Arial', fontsize='10', color='black')
dot.attr('edge', fontname='Arial', fontsize='9', color='black')
entities = data.get('entities', [])
relationships = data.get('relationships', [])
for entity in entities:
entity_name = entity.get('name')
entity_type = entity.get('type', 'strong')
attributes = entity.get('attributes', [])
if not entity_name:
continue
label_parts = [entity_name]
if attributes:
attr_lines = []
for attr in attributes:
attr_name = attr.get('name', '')
attr_type = attr.get('type', 'regular')
is_multivalued = attr.get('multivalued', False)
is_derived = attr.get('derived', False)
is_composite = attr.get('composite', False)
if attr_type == 'primary_key':
if is_multivalued:
attr_display = f"PK: {{ {attr_name} }}"
else:
attr_display = f"PK: {attr_name}"
elif attr_type == 'foreign_key':
attr_display = f"FK: {attr_name}"
else:
attr_display = attr_name
if is_derived:
attr_display = f"/ {attr_display} /"
if is_multivalued:
attr_display = f"{{ {attr_display} }}"
if is_composite:
attr_display = f"( {attr_display} )"
attr_lines.append(attr_display)
if attr_lines:
label_parts.extend(attr_lines)
label = "\\n".join(label_parts)
if entity_type == 'weak':
style = 'filled'
fillcolor = '#e8e8e8'
penwidth = '2'
else:
style = 'filled'
fillcolor = '#d0d0d0'
penwidth = '1'
dot.node(entity_name, label, shape='box', style=style, fillcolor=fillcolor, penwidth=penwidth)
for relationship in relationships:
rel_name = relationship.get('name')
rel_type = relationship.get('type', 'regular')
entities_involved = relationship.get('entities', [])
cardinalities = relationship.get('cardinalities', {})
if not rel_name or len(entities_involved) < 2:
continue
if rel_type == 'identifying':
style = 'filled'
fillcolor = '#c0c0c0'
penwidth = '2'
else:
style = 'filled'
fillcolor = '#c0c0c0'
penwidth = '1'
dot.node(rel_name, rel_name, shape='diamond', style=style, fillcolor=fillcolor, penwidth=penwidth)
for entity in entities_involved:
cardinality = cardinalities.get(entity, '1')
dot.edge(entity, rel_name, label=cardinality)
with NamedTemporaryFile(delete=False, suffix=f'.{output_format}') as tmp:
dot.render(tmp.name, format=output_format, cleanup=True)
return f"{tmp.name}.{output_format}"
except json.JSONDecodeError:
return "Error: Invalid JSON format"
except Exception as e:
return f"Error: {str(e)}" |