[−][src]Macro diesel::allow_columns_to_appear_in_same_group_by_clause
Allow two or more columns which are otherwise unrelated to be used together in a group by clause.
This macro must be invoked any time two columns need to appear in the same group by clause. When this macro is invoked with more than 2 columns, every combination of those columns will be allowed to appear together.
Example
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// This would be required to do // `users::table.inner_join(posts::table).group_by((users::name, users::hair_color, posts::id))` allow_columns_to_appear_in_same_group_by_clause!(users::name, users::hair_color, posts::id);
When more than two columns are passed, the relevant code is generated for every combination of those columns. This code would be equivalent to the previous example.
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allow_columns_to_appear_in_same_group_by_clause!(users::name, users::hair_color); allow_columns_to_appear_in_same_group_by_clause!(users::name, posts::id); allow_columns_to_appear_in_same_group_by_clause!(users::hair_color, posts::id);