Method get_view_info

atomic-repository/src/repository/views.rs:609–653

Get information about a view. Returns the view's metadata including its Merkle state and change count. # Arguments `name` - The name of the view to query # Returns A `ViewInfo` struct with the view's metadata, or an error if the view doesn't exist.

(&self, name: &str)

    /// A `ViewInfo` struct with the view's metadata, or an error if the view
    /// doesn't exist.
    pub fn get_view_info(&self, name: &str) -> Result<ViewInfo, RepositoryError> {
        let txn = self
            .pristine
            .read_txn()
            .map_err(|e| RepositoryError::Database(e.to_string()))?;

        let view = txn
            .get_view(name)
            .map_err(|e| RepositoryError::Database(e.to_string()))?
            .ok_or_else(|| RepositoryError::ViewNotFound {
                name: name.to_string(),
            })?;

        // Resolve parent name and compute own/inherited change counts by
        // actual graph membership rather than by assuming the own log is a
        // superset of the parent (which only holds for `create_view_from`
        // drafts, not for record- or split-created drafts).
        let (parent_name, own_change_count, inherited_change_count) = match view.parent {
            Some(parent_id) => {
                match txn
                    .get_view_by_id(parent_id)
                    .map_err(|e| RepositoryError::Database(e.to_string()))?
                {
                    Some(parent) => {
                        let parent_visible = collect_visible_change_ids(&txn, &parent)?;
                        let own_ids = collect_view_change_ids(&txn, &view)?;
                        let own = own_ids.difference(&parent_visible).count() as u64;
                        (Some(parent.name), own, parent_visible.len() as u64)
                    }
                    None => (None, view.change_count, 0),
                }
            }
            None => (None, view.change_count, 0),
        };

        Ok(ViewInfo {
            name: view.name.clone(),
            state: view.state,
            change_count: view.change_count,
            own_change_count,
            inherited_change_count,
            scope: view.kind,
            parent_name,
        })
    }

    /// Create a new Draft view parented on an explicit named parent.
    ///