nmig/extra_config.json

{
    "README" : [
        "This JSON document represents an additional configuration options.",
        "Currently, following options are available:",
        "tables and columns renaming, generating foreign keys 'on the fly'.",
        "These options will be applied during migration if, and only if",
        "the 'enable_extra_config' attribute from 'config.json' is set true.",
        "By default the 'enable_extra_config' is false, hence the options",
        "described here will not take effect.",
        "Following lines are an example of expected renaming format.",
        "Feel free to modify them.",
        "Note, the 'name' attribute is mandatory",
        "'columns' and 'foreign_keys' attributes are optional",
        "If you don't need to rename columns, then remove the 'columns' attribute.",
        "If you don't need to create foreign keys 'on the fly', then remove the 'foreign_keys' attribute."
    ],

    "tables" : [
        {
            "name" : {
                "original" : "admins",
                "new" : "renamed_admins"
            },

            "columns" : [
                {
                    "original" : "id",
                    "new" : "renamed_id"
                },

                {
                    "original" : "username",
                    "new" : "renamed_username"
                },

                {
                    "original" : "group_id",
                    "new" : "renamed_group_id"
                }
            ]
        },

        {
            "name" : {
                "original" : "groups",
                "new" : "renamed_groups"
            },

            "columns" : [
                {
                    "original" : "id",
                    "new" : "renamed_id"
                }
            ]
        }
    ],

    "README_FKs" : [
        "Following lines are an example of expected foreign keys format.",
        "Feel free to modify them.",
        "Note, if one of the following: 'column_name', 'referenced_table_name', 'referenced_column_name'",
        "has been renamed, then a new name must be used.",
        "Note, possible values for 'update_rule' and 'delete_rule' are 'restrict' or 'cascade'."
    ],

    "foreign_keys" : [
        {
            "constraint_name" : "renamed_admins_renamed_group_id_foreign",
            "table_name" : "renamed_admins",
            "column_name" : "renamed_group_id",
            "referenced_table_name" : "renamed_groups",
            "referenced_column_name" : "renamed_id",
            "update_rule" : "restrict",
            "delete_rule" : "restrict"
        },

        {
            "constraint_name" : "logs_test_3_merchant_id_foreign",
            "table_name" : "logs_test_3",
            "column_name" : "merchant_id",
            "referenced_table_name" : "merchants",
            "referenced_column_name" : "id",
            "update_rule" : "restrict",
            "delete_rule" : "cascade"
        },

        {
            "constraint_name" : "composite_foreign_key_example",
            "table_name" : "loGs_Test-6",
            "column_name" : "id1",
            "referenced_table_name" : "logs_test_4",
            "referenced_column_name" : "id1",
            "update_rule" : "cascade",
            "delete_rule" : "cascade"
        },

        {
            "constraint_name" : "composite_foreign_key_example",
            "table_name" : "loGs_Test-6",
            "column_name" : "id2",
            "referenced_table_name" : "logs_test_4",
            "referenced_column_name" : "id2",
            "update_rule" : "cascade",
            "delete_rule" : "cascade"
        }
    ]
}