Phase 3: Data Binding and Signal Mapping - #7
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Implement runtime evaluation of bindings against Ash resource data: - AshUI.Runtime.BindingEvaluator.evaluate/3 resolves bindings to actual values - Source path resolution for Domain.Resource.Attribute format - Relationship traversal for nested paths (e.g., user.profile.name) - Transformation application: format, compute, default, validate, uppercase/lowercase/trim - Batch evaluation with evaluate_batch/2 - Context-based evaluation with user_id, params, assigns Relates to Phase 3.1: https://specs.planning/phase-03-data-binding-and-signal-mapping.md
Implement two-way data binding for :value type bindings: - read_binding/2 reads from Ash resource to UI elements - write_binding/4 writes user input back to Ash resources - subscribe_binding/3 subscribes to Ash resource changes - reevaluate_binding/4 re-evaluates on resource change notification - Input validation: required, min_length, max_length rules - Input sanitization: trim, strip_tags rules - Socket assigns management for binding values and errors Relates to Phase 3.2: https://specs.planning/phase-03-data-binding-and-signal-mapping.md
Implement collection binding for :list type bindings: - load_collection/3 loads collections from Ash resources with pagination - subscribe_collection/3 subscribes to collection changes for reactivity - handle_collection_change/5 handles insert/update/delete operations - format_collection/3 formats items with transformations (format, compute) - Pagination support: page, page_size, has_next, has_prev - Filtering support via opts - Scroll position tracking for reactive updates Relates to Phase 3.3: https://specs.planning/phase-03-data-binding-and-signal-mapping.md
Implement event-driven binding for :action type bindings: - execute_action/4 executes Ash actions in response to UI events - event_handler/2 generates LiveView event handler from binding - wire_handlers/2 wires action bindings to LiveView handle_event/3 - Authorization check before action execution - Parameter mapping: event, context, static sources - Success/error handling with flash messages and result storage - Event data passed to action parameters Relates to Phase 3.4: https://specs.planning/phase-03-data-binding-and-signal-mapping.md
Convert Ash bindings to unified-ui signal format: - AshUI.Signal.Struct with id, source, target, type, transform, metadata - Signal creation helpers: bidirectional/2, collection/2, event/2 - Signal validation with validate/1 - CloudEvents-compatible format via AshUI.Signal.CloudEvents - to_cloud_event/1 converts signal to CloudEvents spec - from_cloud_event/1 converts CloudEvents back to signal - Batch support with batch/1 for multiple signals - Serialization to JSON, binary, or text formats Relates to Phase 3.5: https://specs.planning/phase-03-data-binding-and-signal-mapping.md
Added comprehensive integration tests for all Phase 3 modules: - Signal.Struct tests for signal structure creation and validation - Signal.CloudEvents tests for CloudEvents format conversion - Runtime.ActionBinding tests for action execution and wiring - Runtime.ListBinding tests for collection loading and changes - Runtime.BidirectionalBinding tests for read/write operations - Runtime.BindingEvaluator tests for binding evaluation All tests cover success and error scenarios.
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Summary
Implements reactive data binding from Ash resources to UI elements through unified-ui signal format (Phase 3).
Section 3.1 - Binding Evaluation
AshUI.Runtime.BindingEvaluatorfor runtime binding resolutionSection 3.2 - Bidirectional Value Bindings
:valuetype bindingsSection 3.3 - List Bindings
:listtype bindingsSection 3.4 - Action Bindings
:actiontype bindingsSection 3.5 - Signal Format Conversion
AshUI.Signal.Structfor signal structureSection 3.6 - Integration Tests
Test plan