NAME¶

Catmandu::Fix::Bind::hashmap - a binder to add key/value pairs to an internal hashmap

SYNOPSIS¶

 # Find non unique ISBN numbers in the record stream
 do hashmap(join: ',')
    copy_field(isbn,key)
    copy_field(_id,value)
 end
 # will export to the JSON exporter a hash map containing all isbn occurrences in the stream
 { "_id": "9781565920422" , "value": "rec0001,rec0329,rec1032" }
 { "_id": "9780596004927" , "value": "rec0718" }
 # Ignore the values. Count the number of ISBN occurrences in a stream
 # File: count.fix:
 do hashmap(count: 1)
    copy_field(isbn,key)
 end
 # Use the Null exporter to suppress the normal output
 $ cat /tmp/data.json | catmandu convert JSON --fix count.fix to Null

DESCRIPTION¶

The hashmap binder will insert all key/value pairs given to a internal hashmap that can be exported using an Catmandu::Exporter.

The 'key' fields in the internal hashmap will be exported as '_id' field.

If the key in the hashmap Bind is an ARRAY, then multiple key/value pairs will be inserted into the hashmap.

By default all the values will be added as an array to the hashmap. Every key will have one or more values. Use the 'join' parameter to create a string out of this array.

CONFIGURATION¶

    do hashmap(exporter: JSON, file:/tmp/data.json, count: 1)
      ...
    end

    do hashmap(store: MongoDB, database_name: test, bag: data, count: 1)
      ...
    end

SEE ALSO¶

Catmandu::Fix::Bind