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ReQL command: max

Command syntax

sequence.max(field | function) → element

sequence.max({index: <indexname>}) → element

r.max(sequence, field | function) → element

r.max(sequence, {index: <indexname>}) → element

Description

Finds the maximum element of a sequence.

The max command can be called with:

  • a field name, to return the element of the sequence with the largest value in that field;
  • an index (the primary key or a secondary index), to return the element of the sequence with the largest value in that index;
  • a function, to apply the function to every element within the sequence and return the element which returns the largest value from the function, ignoring any elements where the function produces a non-existence error.

For more information on RethinkDB’s sorting order, read the section in ReQL data types.

Calling max on an empty sequence will throw a non-existence error; this can be handled using the default command.

Example: Return the maximum value in the list [3, 5, 7].

r.expr([3, 5, 7]).max().run(conn, callback);

Example: Return the user who has scored the most points.

r.table('users').max('points').run(conn, callback);

Example: The same as above, but using a secondary index on the points field.

r.table('users').max({index: 'points'}).run(conn, callback);

Example: Return the user who has scored the most points, adding in bonus points from a separate field using a function.

r.table('users').max(function(user) {
    return user('points').add(user('bonusPoints'));
}).run(conn, callback);

Example: Return the highest number of points any user has ever scored. This returns the value of that points field, not a document.

r.table('users').max('points')('points').run(conn, callback);

Example: Return the user who has scored the most points, but add a default null return value to prevent an error if no user has ever scored points.

r.table('users').max('points').default(null).run(conn, callback);

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