Search and metadata in HLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main component responsible for storing metadata in a search system.

HLD

class [1]:
    def __init__(self):
        self.metadata_store = {}

Drag options to blanks, or click blank then click option'

AIndexBuilder

BMetadataStore

CQueryProcessor

DSearchEngine

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing SearchEngine instead of MetadataStore

Confusing IndexBuilder with metadata storage

The MetadataStore class is responsible for storing metadata in a search system.

2fill in blank

medium

Complete the code to add a method that indexes a document's metadata.

HLD

def index_metadata(self, document_id, metadata):
    self.metadata_store[[1]] = metadata

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Adocument_id

Bmetadata

Cindex

Ddoc

Attempts:

3 left

💡 Hint

Common Mistakes

Using metadata as the key instead of document_id

Using a generic name like index which is undefined

The document_id is used as the key to store metadata in the metadata store.

3fill in blank

hard

Fix the error in the method that retrieves metadata for a given document.

HLD

def get_metadata(self, document_id):
    return self.metadata_store.get([1], None)

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Ametadata

Bdoc_id

Cdocument_id

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using metadata or id which are not keys in the store

Using doc_id which is undefined in this context

The method should use document_id to retrieve the metadata from the store.

4fill in blank

hard

Fill both blanks to create a function that filters documents by a metadata key and value.

HLD

def filter_documents(self, key, value):
    return [doc_id for doc_id, meta in self.metadata_store.items() if meta.get([1]) [2] value]

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Akey

B==

C!=

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'value' instead of 'key' in the first blank

Using '!=' instead of '==' for filtering matching documents

The function checks if the metadata's key equals the given value to filter documents.

5fill in blank

hard

Fill all three blanks to build a dictionary comprehension that maps document IDs to metadata values for a specific key if the value exists.

HLD

result = {doc_id: meta.get([1]) for doc_id, meta in self.metadata_store.items() if meta.get([2]) is not [3]

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Akey

CNone

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using different keys for the two meta.get calls

Checking against 'value' instead of None

The comprehension maps doc_id to the metadata value for key only if the value is not None.