dm 0.2.0

Breaking changes

• Deprecate dm_get_src() tbl.dm(), src_tbls.dm(), copy_to.dm(). These functions have better alternatives and use the notion of a "data source" which is being phased out of dplyr (#527).
• *_pk() and *_fk() functions gain an ellipsis argument that comes before check, force and rm_referencing_fks arguments (#520).

Features

• dm_add_pk() and dm_add_fk() support compound keys via the c() notation, e.g. dm_add_pk(dm, table, c(col1, col2)). dm_nycflights13() returns a data model with compound keys by default. Use compound = FALSE to return the data model from dm v0.1.13 or earlier (#3).
• dm_get_all_fks() includes parent_pk_cols column that describes the primary key columns of the parent table (#335).
• dm_from_src() supports the schema argument also for MariaDB and MySQL databases (#516).
• dm objects now inherit from "dm_v1" in addition to "dm", to allow backward-compatible changes of the internal format (#521).
• Use hack to create compound primary keys on the database (#522).
• dm_examine_constraints() and other check functions count the number of rows that violate constraints for primary and foreign keys (#335).
• copy_dm_to(set_key_constraints = FALSE) downgrades unique indexes to regular indexes (#335).
• rows_truncate() implemented for data frames (#335).
• dm_enum_fk_candidates() enumerates column in the order they apper in the table (#335).