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dev day #65
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Tomas Dvorak
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# New Utility Controllers - Summary
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## Overview
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I've added **7 powerful utility controllers** that dramatically simplify development and reduce boilerplate code by up to **70%**.
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## What's New
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### ✅ 1. Response Helper (`response_helper.go`)
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- **Purpose:** Standardized API responses
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- **Global Variable:** `Respond`
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- **Benefits:** Consistent format, easy error handling, metadata support
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```go
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Respond.Success(c, data, "Success message")
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Respond.Created(c, newItem, "Item created")
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Respond.NotFound(c, "Item not found")
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```
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### ✅ 2. Pagination Helper (`pagination_helper.go`)
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- **Purpose:** One-line pagination for any query
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- **Global Variable:** `Paginator`
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- **Benefits:** Auto-extracts params, calculates metadata, supports preloading
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```go
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meta, err := Paginator.Paginate(c, query, &items)
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Respond.SuccessWithMeta(c, items, meta, "Success")
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```
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### ✅ 3. Query Helper (`query_helper.go`)
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- **Purpose:** Simplified filtering, sorting, and searching
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- **Global Variable:** `QueryParser`
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- **Benefits:** Fluent API, multiple filter types, chain builder
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```go
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query := QueryParser.BuildQueryChain(c, db).
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WithSearch("title", "content").
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WithSort("created_at", "desc").
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WithBoolFilter("published", "published").
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Build()
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```
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### ✅ 4. Validation Helper (`validation_helper.go`)
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- **Purpose:** Struct validation with custom validators
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- **Global Variable:** `Validator`
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- **Benefits:** Auto-respond on errors, sanitization, custom validators
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```go
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if !Validator.ValidateAndRespond(c, req) {
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return // Response already sent
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}
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title := Validator.SanitizeString(req.Title)
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```
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### ✅ 5. Audit Log Controller (`audit_log_controller.go`)
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- **Purpose:** Track all important actions
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- **Global Variable:** `AuditLogger`
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- **Model:** `models.AuditLog`
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- **Benefits:** Automatic user/IP tracking, before/after changes, searchable logs
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```go
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AuditLogger.LogCreate(c, "Article", article.ID, "Article created")
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AuditLogger.LogUpdate(c, "Article", id, "Updated", before, after)
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AuditLogger.LogDelete(c, "Article", id, "Deleted")
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```
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### ✅ 6. Batch Operations Controller (`batch_operations_controller.go`)
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- **Purpose:** Bulk operations on multiple records
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- **Global Variable:** `BatchOps`
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- **Benefits:** Delete, update, publish, reorder multiple items at once
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```go
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BatchOps.BatchDelete(c, &models.Article{}, "articles")
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BatchOps.BatchPublish(c, &models.Article{}, "articles", true)
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```
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### ✅ 7. Export Helper (`export_helper.go`)
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- **Purpose:** Export data to CSV/JSON
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- **Global Variable:** `Exporter`
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- **Benefits:** Automatic file download, proper headers
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```go
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Exporter.ExportToCSV(c, articles, "articles.csv", headers)
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Exporter.ExportToJSON(c, articles, "articles.json")
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```
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## Setup Instructions
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### Step 1: Install Dependency
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```bash
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go get github.com/go-playground/validator/v10
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```
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### Step 2: Add Model to Migration
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In `main.go`, add to `AutoMigrate`:
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```go
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&models.AuditLog{},
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```
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### Step 3: Initialize Global Helpers
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Add after database initialization in `main.go`:
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```go
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// Initialize utility controllers
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controllers.InitAuditLogger(dbInstance)
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controllers.InitBatchOperations(dbInstance)
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```
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### Step 4: Use in Controllers
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The global variables are ready to use:
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- `controllers.Respond`
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- `controllers.Paginator`
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- `controllers.QueryParser`
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- `controllers.Validator`
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- `controllers.AuditLogger`
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- `controllers.BatchOps`
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- `controllers.Exporter`
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## Example: Before vs After
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### Before (Old Way) - 45 lines
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```go
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func GetArticles(c *gin.Context) {
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// Parse pagination
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page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
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pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
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if page < 1 {
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page = 1
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}
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if pageSize < 1 || pageSize > 100 {
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pageSize = 20
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}
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offset := (page - 1) * pageSize
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// Build query
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query := db.Model(&models.Article{})
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// Search
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if search := c.Query("search"); search != "" {
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pattern := "%" + search + "%"
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query = query.Where("title LIKE ? OR content LIKE ?", pattern, pattern)
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}
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// Filter
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if published := c.Query("published"); published != "" {
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query = query.Where("published = ?", published == "true")
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}
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// Sort
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if sort := c.Query("sort"); sort != "" {
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query = query.Order(sort)
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} else {
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query = query.Order("created_at DESC")
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}
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// Count total
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var total int64
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query.Count(&total)
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// Execute
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var articles []models.Article
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if err := query.Offset(offset).Limit(pageSize).Find(&articles).Error; err != nil {
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c.JSON(500, gin.H{"error": "Database error"})
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return
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}
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// Response
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c.JSON(200, gin.H{
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"data": articles,
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"page": page,
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"total": total,
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})
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}
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```
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### After (New Way) - 11 lines
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```go
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func GetArticles(c *gin.Context) {
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query := controllers.QueryParser.BuildQueryChain(c, db.Model(&models.Article{})).
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WithSearch("title", "content").
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WithSort("created_at", "desc").
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WithBoolFilter("published", "published").
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Build()
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var articles []models.Article
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meta, _ := controllers.Paginator.Paginate(c, query, &articles)
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controllers.Respond.SuccessWithMeta(c, articles, meta, "Success")
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}
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```
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**Result:** 75% less code, more features, better consistency!
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## Real-World Example
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See `poll_controller_refactored.go` for a complete CRUD controller using all utilities:
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- ✅ Pagination with filtering
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- ✅ Search and sort
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- ✅ Input validation
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- ✅ Sanitization
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- ✅ Audit logging
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- ✅ Batch operations
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- ✅ Standardized responses
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## API Examples
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### List with Filters
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```bash
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GET /api/v1/articles?search=football&published=true&sort=created_at:desc&page=1&page_size=20
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```
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### Batch Delete
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```bash
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POST /api/v1/articles/batch-delete
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Content-Type: application/json
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{"ids": [1, 2, 3, 4, 5]}
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```
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### Batch Publish
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```bash
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POST /api/v1/articles/batch-publish
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Content-Type: application/json
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{"ids": [1, 2, 3]}
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```
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### Export to CSV
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```bash
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GET /api/v1/articles/export/csv
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```
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### Audit Logs
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```bash
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GET /api/v1/admin/audit-logs?action=CREATE&entity_type=Article&from=2024-01-01
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```
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## Files Created
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1. ✅ `internal/controllers/response_helper.go`
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2. ✅ `internal/controllers/pagination_helper.go`
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3. ✅ `internal/controllers/query_helper.go`
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4. ✅ `internal/controllers/validation_helper.go`
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5. ✅ `internal/controllers/audit_log_controller.go`
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6. ✅ `internal/controllers/batch_operations_controller.go`
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7. ✅ `internal/controllers/export_helper.go`
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8. ✅ `internal/controllers/example_usage_controller.go`
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9. ✅ `internal/controllers/poll_controller_refactored.go`
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10. ✅ `internal/models/audit_log.go`
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11. ✅ `DOCS/NEW_UTILITY_CONTROLLERS_GUIDE.md` (Complete documentation)
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## Benefits Summary
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| Feature | Before | After | Improvement |
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|---------|--------|-------|-------------|
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| **Code Lines** | 45 | 11 | 75% reduction |
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| **Response Format** | Inconsistent | Standardized | ✅ |
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| **Pagination** | Manual | Automatic | ✅ |
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| **Filtering** | Manual | Built-in | ✅ |
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| **Searching** | Manual | Built-in | ✅ |
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| **Sorting** | Manual | Built-in | ✅ |
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| **Validation** | Manual | Automatic | ✅ |
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| **Audit Logging** | None | Automatic | ✅ |
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| **Batch Operations** | None | Built-in | ✅ |
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| **Export** | None | Built-in | ✅ |
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## Key Improvements
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### 🚀 Productivity
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- Write **70% less code** for common operations
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- **Faster development** with ready-to-use utilities
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- **Reduced bugs** through standardization
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### 🎯 Consistency
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- **Uniform API responses** across all endpoints
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- **Standard error handling** patterns
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- **Consistent validation** messages
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### 🔧 Maintainability
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- **Single source of truth** for common operations
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- **Easy to update** - change once, apply everywhere
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- **Better testing** - test utilities once
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### 📊 Features
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- **Advanced filtering** out of the box
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- **Full-text search** across multiple fields
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- **Audit trail** for compliance
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- **Bulk operations** for efficiency
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- **Data export** for reporting
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### 🛡️ Security
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- **Input validation** and sanitization
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- **Audit logging** for accountability
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- **Safe batch operations** with transaction support
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## Next Steps
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1. **Review documentation:** `DOCS/NEW_UTILITY_CONTROLLERS_GUIDE.md`
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2. **Install dependency:** `go get github.com/go-playground/validator/v10`
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3. **Add migration:** Add `&models.AuditLog{}` to AutoMigrate
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4. **Initialize helpers:** Add init calls to `main.go`
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5. **Refactor controllers:** Start using utilities in existing controllers
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6. **Test endpoints:** Try the example API calls
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## Support
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For detailed usage examples, see:
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- 📖 `DOCS/NEW_UTILITY_CONTROLLERS_GUIDE.md` - Complete guide
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- 💡 `internal/controllers/example_usage_controller.go` - Usage examples
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- 🔄 `internal/controllers/poll_controller_refactored.go` - Real refactoring example
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## Questions?
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Each utility controller is well-documented with:
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- Purpose and benefits
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- Usage examples
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- Best practices
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- Common patterns
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Start with the guide in `DOCS/` and refer to example files for practical implementations.
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---
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**Your job is now easier, simpler, and better!** 🎉
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