LWCAdvancedwireimperativelds
Combine GraphQL wire with imperative Apex for unsupported UI API fields
Real World Scenario
Record header needs Account fields plus custom rollup not in GraphQL schema. Team runs three wires and two Apex calls.
Expected Answer
• Single GraphQL wire for maximum standard and custom scalar fields
• One imperative Apex call for rollup supplement not second wire
• Merge results in @track viewModel decoupling wire sources from template
• Loading state until both sources complete or fail independently
• Partial render: show wire data while rollup loads
• Error isolation: rollup failure does not blank header wire data
• Re-evaluate when UI API adds field reducing imperative need
Follow-Up Questions & Answers
Click to expand — each follow-up includes a direct, interview-ready answer
Stay within limits by: Single GraphQL wire for maximum standard and custom scalar fields. Bulkify everything — never query or DML in loops. Merge results in @track viewModel decoupling wire sources from template. Hybrid data layer needs viewModel merge—template should not know five data source origins. Optimize for scale and operational observability.
Architect Perspective
Hybrid data layer needs viewModel merge—template should not know five data source origins.