feat(deploy): production deployment setup and fixes
- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
This commit is contained in:
yeuimu
+114
-114
@@ -1,114 +1,114 @@
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---
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title: Template Expressions Must Be Single Expressions
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impact: MEDIUM
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impactDescription: Using statements instead of expressions in templates causes compilation errors
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type: capability
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tags: [vue3, template, expressions, interpolation, syntax]
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---
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# Template Expressions Must Be Single Expressions
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**Impact: MEDIUM** - Vue templates only support single JavaScript expressions, not statements. Using variable declarations, if statements, or multiple statements will cause template compilation errors.
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Template interpolation `{{ }}` and directive bindings evaluate JavaScript expressions that produce a value. Statements like `if`, `for`, variable declarations, or multi-line code blocks are not allowed.
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## Task Checklist
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- [ ] Use only single expressions in `{{ }}` interpolation
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- [ ] Use ternary operators instead of if/else statements
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- [ ] Move complex logic to computed properties or methods
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- [ ] Avoid variable declarations in templates
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- [ ] Use `v-if`/`v-else` directives for conditional rendering
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**Incorrect:**
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```vue
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<template>
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<!-- ERROR: Variable declaration is a statement, not expression -->
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<p>{{ var greeting = 'Hello' }}</p>
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<p>{{ let x = 1 }}</p>
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<p>{{ const name = 'Vue' }}</p>
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<!-- ERROR: if statement not allowed -->
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<p>{{ if (ok) { return message } }}</p>
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<p>{{ if (user) return user.name }}</p>
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<!-- ERROR: Multiple statements not allowed -->
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<p>{{ count++; return count }}</p>
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<p>{{ items.push(newItem); items.length }}</p>
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<!-- ERROR: for/while loops not allowed -->
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<p>{{ for (let i = 0; i < 5; i++) { } }}</p>
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</template>
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```
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**Correct:**
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```vue
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<template>
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<!-- OK: Simple expressions -->
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<p>{{ message }}</p>
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<p>{{ count + 1 }}</p>
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<p>{{ items.length }}</p>
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<!-- OK: Ternary operators for conditionals -->
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<p>{{ ok ? 'YES' : 'NO' }}</p>
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<p>{{ user ? user.name : 'Guest' }}</p>
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<p>{{ score >= 60 ? 'Pass' : 'Fail' }}</p>
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<!-- OK: Method/function calls -->
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<p>{{ formatDate(date) }}</p>
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<p>{{ items.filter(i => i.active).length }}</p>
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<!-- OK: Chained expressions -->
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<p>{{ message.split('').reverse().join('') }}</p>
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<!-- OK: Template literals -->
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<p>{{ `Hello, ${name}!` }}</p>
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<!-- OK: Object/array expressions -->
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<p>{{ { name: 'Vue', version: 3 } }}</p>
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</template>
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<script setup>
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import { ref, computed } from 'vue'
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const ok = ref(true)
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const message = ref('Hello')
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const user = ref({ name: 'Alice' })
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const score = ref(85)
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// Move complex logic to computed properties
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const greeting = computed(() => {
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if (user.value) {
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return `Welcome back, ${user.value.name}!`
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}
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return 'Hello, Guest!'
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})
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// Or use methods for reusable logic
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function formatDate(date) {
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return new Date(date).toLocaleDateString()
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}
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</script>
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```
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## Use Directives for Control Flow
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```vue
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<template>
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<!-- Instead of if/else in expressions, use v-if/v-else -->
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<p v-if="user">Welcome, {{ user.name }}!</p>
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<p v-else>Please log in</p>
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<!-- Instead of loops in expressions, use v-for -->
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<ul>
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<li v-for="item in items" :key="item.id">{{ item.name }}</li>
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</ul>
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<!-- Conditional display without removing from DOM -->
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<p v-show="isVisible">This toggles visibility</p>
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</template>
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```
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## Reference
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- [Vue.js Template Syntax - Using JavaScript Expressions](https://vuejs.org/guide/essentials/template-syntax.html#using-javascript-expressions)
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- [Vue.js Conditional Rendering](https://vuejs.org/guide/essentials/conditional.html)
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---
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title: Template Expressions Must Be Single Expressions
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impact: MEDIUM
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impactDescription: Using statements instead of expressions in templates causes compilation errors
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type: capability
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tags: [vue3, template, expressions, interpolation, syntax]
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---
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# Template Expressions Must Be Single Expressions
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**Impact: MEDIUM** - Vue templates only support single JavaScript expressions, not statements. Using variable declarations, if statements, or multiple statements will cause template compilation errors.
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Template interpolation `{{ }}` and directive bindings evaluate JavaScript expressions that produce a value. Statements like `if`, `for`, variable declarations, or multi-line code blocks are not allowed.
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## Task Checklist
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- [ ] Use only single expressions in `{{ }}` interpolation
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- [ ] Use ternary operators instead of if/else statements
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- [ ] Move complex logic to computed properties or methods
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- [ ] Avoid variable declarations in templates
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- [ ] Use `v-if`/`v-else` directives for conditional rendering
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**Incorrect:**
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```vue
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<template>
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<!-- ERROR: Variable declaration is a statement, not expression -->
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<p>{{ var greeting = 'Hello' }}</p>
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<p>{{ let x = 1 }}</p>
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<p>{{ const name = 'Vue' }}</p>
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<!-- ERROR: if statement not allowed -->
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<p>{{ if (ok) { return message } }}</p>
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<p>{{ if (user) return user.name }}</p>
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<!-- ERROR: Multiple statements not allowed -->
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<p>{{ count++; return count }}</p>
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<p>{{ items.push(newItem); items.length }}</p>
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<!-- ERROR: for/while loops not allowed -->
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<p>{{ for (let i = 0; i < 5; i++) { } }}</p>
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</template>
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```
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**Correct:**
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```vue
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<template>
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<!-- OK: Simple expressions -->
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<p>{{ message }}</p>
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<p>{{ count + 1 }}</p>
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<p>{{ items.length }}</p>
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<!-- OK: Ternary operators for conditionals -->
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<p>{{ ok ? 'YES' : 'NO' }}</p>
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<p>{{ user ? user.name : 'Guest' }}</p>
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<p>{{ score >= 60 ? 'Pass' : 'Fail' }}</p>
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<!-- OK: Method/function calls -->
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<p>{{ formatDate(date) }}</p>
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<p>{{ items.filter(i => i.active).length }}</p>
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<!-- OK: Chained expressions -->
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<p>{{ message.split('').reverse().join('') }}</p>
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<!-- OK: Template literals -->
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<p>{{ `Hello, ${name}!` }}</p>
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<!-- OK: Object/array expressions -->
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<p>{{ { name: 'Vue', version: 3 } }}</p>
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</template>
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<script setup>
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import { ref, computed } from 'vue'
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const ok = ref(true)
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const message = ref('Hello')
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const user = ref({ name: 'Alice' })
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const score = ref(85)
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// Move complex logic to computed properties
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const greeting = computed(() => {
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if (user.value) {
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return `Welcome back, ${user.value.name}!`
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}
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return 'Hello, Guest!'
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})
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// Or use methods for reusable logic
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function formatDate(date) {
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return new Date(date).toLocaleDateString()
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}
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</script>
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```
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## Use Directives for Control Flow
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```vue
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<template>
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<!-- Instead of if/else in expressions, use v-if/v-else -->
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<p v-if="user">Welcome, {{ user.name }}!</p>
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<p v-else>Please log in</p>
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<!-- Instead of loops in expressions, use v-for -->
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<ul>
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<li v-for="item in items" :key="item.id">{{ item.name }}</li>
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</ul>
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<!-- Conditional display without removing from DOM -->
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<p v-show="isVisible">This toggles visibility</p>
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</template>
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```
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## Reference
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- [Vue.js Template Syntax - Using JavaScript Expressions](https://vuejs.org/guide/essentials/template-syntax.html#using-javascript-expressions)
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- [Vue.js Conditional Rendering](https://vuejs.org/guide/essentials/conditional.html)
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