![]() ![]() Drupal detects this change as it has set the cache tag of post node type as 5 and triggers cache invalidation. Suppose one of the blog posts having id 5 is updated. This ensures that old data is not shown to users.Įxample: Consider an example where inside our site, we have a blog content type, and we have implemented caching for the blog posts with cache tags. Cache invalidation involves identifying and invalidating all cache entries associated with the changed data. Cache Invalidation: When data changes in Drupal, whether it’s a node being updated, a configuration change, or any other relevant event, Drupal triggers cache invalidation.When a user visits a page, Drupal checks the cache context for the language and serves the cached version of the page specific to that language, if available. By utilizing cache contexts for language, Drupal can cache different versions of the same page based on the user’s language preference. Each page can be displayed in different languages, and content translation is managed through Drupal’s translation system. ![]() Example: Let us suppose our site having multilingual support. This ensures that each user sees their personalized recommendations while still benefiting from caching for other static elements on the page. For example, a block containing user-specific recommendations can have cacheability metadata with a cache context for the user’s role. By leveraging cache contexts, Drupal can serve personalized content while still benefiting from caching. This ensures that users see the updated product information when they visit the corresponding product page.Ĭache Contexts: Cache contexts allow Drupal to vary cache entries based on different conditions, such as user roles, languages, or device types. When a product’s price or description is modified, Drupal automatically invalidates the cache entries related to that product’s cache tag. Each product node is associated with a specific cache tag. For example, when a node is updated, Drupal invalidates cache entries associated with that node’s cache tag, ensuring that the updated content is delivered.Įxample: Suppose in our site we have a product catalog. They allow Drupal to invalidate related cache entries when changes occur efficiently. Cache tags identify the entities or elements that affect the cached content, cache contexts define the variations in the cached content based on contextual information, and cache max-age specifies how long the cache entry is considered valid.Ĭache Tags: Cache tags are a type of strings.
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