did.query

The did.query module provides the Query class, which is used to construct search queries for the database.

Query Class

The Query class allows you to build complex search queries by combining simple search terms. You can create a query by specifying a field, an operation, and one or more parameters.

Usage

To create a new Query object, you can provide a field, an operation, and parameters:

from did.query import Query

# Find all documents where the 'name' field is 'myname'
q1 = Query('base.name', 'exact_string', 'myname')

# Find all documents where the 'value' field is greater than 10
q2 = Query('my_data.value', 'greaterthan', 10)

You can also combine queries using the & (and) and | (or) operators:

# Find all documents where the name is 'myname' AND the value is greater than 10
q3 = q1 & q2

# Find all documents where the name is 'myname' OR the value is greater than 10
q4 = q1 | q2

Search Operations

The Query class supports a variety of search operations, including:

• exact_string: Exact string match.
• regexp: Regular expression match.
• contains_string: Substring match.
• exact_number: Exact number match.
• lessthan, greaterthan, lessthaneq, greaterthaneq: Numeric comparisons.
• hasfield: Checks for the existence of a field.
• isa: Checks if a document is of a certain class or superclass.
• depends_on: Checks for a specific dependency.