Struct SchemaUpdate 

pub struct SchemaUpdate { /* private fields */ }

A pending schema update that can be applied to a schema to produce a new version.

Implementations

impl SchemaUpdate

pub fn new() -> Self

pub fn add_column( self, parent_id: Option<i32>, name: impl Into<String>, field_type: Type, doc: Option<String>, ) -> Self

adds a new column to the schema.

pub fn delete_column(self, field_id: i32) -> Self

Deletes a column from the schema.

pub fn rename_column(self, field_id: i32, new_name: impl Into<String>) -> Self

Renames a column.

pub fn update_type(self, field_id: i32, new_type: Type) -> Self

Updates a column’s type (must be compatible).

pub fn make_optional(self, field_id: i32) -> Self

Makes a required column optional.

pub fn apply( self, base_schema: &Schema, new_schema_id: i32, next_column_id: &mut i32, ) -> Result<Schema, String>

Applies the changes to a base schema, producing a new schema.

Arguments

• base_schema - The schema to start from
• new_schema_id - The ID for the new schema
• next_column_id - A mutable reference to the next available column ID setter

Trait Implementations

impl Default for SchemaUpdate

fn default() -> Self

Returns the “default value” for a type.