Tests if a string or an array contains a certain string.
Command Syntax
attr(attribute).contains(operand)
Note: operand must be a string
Usage
const d = new Dynaflo(config);
d.table('Movies')
.query({year: 2015})
.where(attr('title').contains('Big')))
.run()
.then(data => {
// returns movies with year = 2015 with title containing the substring 'Big'
});
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