fix: context for group_by_exp/where_exp/find_exp, #790

src/filters/array.ts

@@ -140,7 +140,9 @@ export function * where_exp<T extends object> (this: FilterImpl, arr: T[], itemN
   const array = toArray(arr)
   this.context.memoryLimit.use(array.length)
   for (const item of array) {
-    const value = yield keyTemplate.value(this.context.spawn({ [itemName]: item }))
+    this.context.push({ [itemName]: item })
+    const value = yield keyTemplate.value(this.context)
+    this.context.pop()
     if (value) filtered.push(item)
   }
   return filtered
@@ -165,7 +167,9 @@ export function * group_by_exp<T extends object> (this: FilterImpl, arr: T[], it
   arr = toEnumerable(arr)
   this.context.memoryLimit.use(arr.length)
   for (const item of arr) {
-    const key = yield keyTemplate.value(this.context.spawn({ [itemName]: item }))
+    this.context.push({ [itemName]: item })
+    const key = yield keyTemplate.value(this.context)
+    this.context.pop()
     if (!map.has(key)) map.set(key, [])
     map.get(key).push(item)
   }
@@ -185,7 +189,9 @@ export function * find_exp<T extends object> (this: FilterImpl, arr: T[], itemNa
   const predicate = new Value(stringify(exp), this.liquid)
   const array = toArray(arr)
   for (const item of array) {
-    const value = yield predicate.value(this.context.spawn({ [itemName]: item }))
+    this.context.push({ [itemName]: item })
+    const value = yield predicate.value(this.context)
+    this.context.pop()
     if (value) return item
   }
 }

test/integration/filters/array.spec.ts

@@ -522,6 +522,20 @@ describe('filters/array', function () {
         - Garlic press
         `)
     })
+    it('should be aware context', function () {
+      const tpl = `{% assign kitchen_products = products | where_exp: "item", "item.type == target" %}
+        Kitchen products:
+        {% for product in kitchen_products -%}
+        - {{ product.title }}
+        {% endfor %}`
+      const scope = { products, target: 'kitchen' }
+      const html = `
+        Kitchen products:
+        - Spatula
+        - Garlic press
+        `
+      return test(tpl, scope, html)
+    })
   })
   describe('group_by', function () {
     const members = [