Struct Capabilities 

pub struct Capabilities {
    pub filter_actions: bool,
    pub recoverable_messages: bool,
    pub replies: bool,
    pub associated_message_guids: bool,
    /* private fields */
}

Features of a Messages database schema, probed from the live database.

Each flag guards the SQL constructs that reference its column or table: when a flag is false, composed queries substitute a neutral placeholder so deserialization behaves uniformly across schemas.

Fields

filter_actions: bool

Both filter_action and filter_sub_action exist on message.

The pair is one feature: queries project either both real columns or two NULL placeholders. A schema carrying only one of the pair reads None for both, keeping FilterAction parsing off partial data.

recoverable_messages: bool

The chat_recoverable_message_join table exists, so recently deleted messages can be identified and filtered.

replies: bool

thread_originator_guid exists on message, so replies can be counted and grouped.

associated_message_guids: bool

associated_message_guid exists on message, so tapbacks and poll votes can be resolved.

Implementations

impl Capabilities

pub fn determine(db: &Connection) -> Result<Self, TableError>

Probe the schema of the supplied database.

pub fn without_derived_features(&self) -> Self

Return a copy with the row-enrichment features disabled: recoverable_messages, replies, and filter_actions.

Narrow scans that only need the base projection (e.g. the tapback cache) use this to skip correlated subqueries and joins those features would add.

pub fn message_columns(&self) -> &[&'static str]

Recognized message columns this schema declares, in canonical order.

pub fn attachment_columns(&self) -> &[&'static str]

Recognized attachment columns this schema declares, in canonical order.

Trait Implementations

impl Clone for Capabilities

fn clone(&self) -> Capabilities

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Capabilities

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.