Update strategy

[SimonRethore]

Add Update strategy to only update existing lines

[thislg]

Can you add an example? I'm not sure to understand update_load_identifier and update_copy_identifier.

[SimonRethore]

Yes, this is an example of config :

name: articles
source_dir: "var/exchange/input"

archive:
    enabled: true
    dir: "var/exchange/archives"
    rotation: 14
quarantine:
    dir: "var/exchange/quarantine"
    enabled: false

resources:
    article:
        tablename: import.article
        load:
            pattern: "^articles.csv$"
            format_options:
                validate_headers: true
                with_header: true
                line_delimiter: "\n"
            fields:
                reference: ~
                name: ~
                description: ~
    copy_article:
        tablename: import.article
        copy:
            target: article
            strategy: update
            strategy_options:
                conflict_target: id
                update_load_identifier: reference
                update_copy_identifier: id
            mapping:
                reference: id
                name: name
                description: description