Struct query_structure::prelude::ModelProjection

pub struct ModelProjection { /* private fields */ }

Projection of a Model. A projection is a (sub)set of fields of a model. There can only ever be fields of one model contained in a particular ModelProjection

Implementations

impl ModelProjection

pub fn new(fields: Vec<Field>) -> Self

pub fn new_from_scalar(fields: Vec<ScalarFieldRef>) -> Self

pub fn names(&self) -> impl Iterator<Item = &str>

Returns all field names (NOT database level column names!) of contained fields.

pub fn db_names(&self) -> impl Iterator<Item = String> + '_

Returns all database (e.g. column or field) names of contained fields.

pub fn fields(&self) -> impl Iterator<Item = &Field>

Returns an iterator over all fields contained in this projection.

pub fn scalar_length(&self) -> usize

Returns the length of scalar fields contained in this projection, e.g. the actual number of SQL columns or document fields for this model projection.

pub fn scalar_fields(&self) -> impl Iterator<Item = ScalarFieldRef> + '_

Returns an iterator over all scalar fields represented by this model projection, in order. Resolves relation fields to all backing scalar fields, if existing.

pub fn map_db_name(&self, name: &str) -> Option<ScalarFieldRef>

pub fn type_identifiers_with_arities(&self) -> Vec<(TypeIdentifier, FieldArity)>

Trait Implementations

impl Clone for ModelProjection

fn clone(&self) -> ModelProjection

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ModelProjection

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

Formats the value using the given formatter.

impl Default for ModelProjection

fn default() -> ModelProjection

Returns the “default value” for a type.

impl From<&FieldSelection> for ModelProjection

[Composites] todo: Temporary converter.

fn from(fs: &FieldSelection) -> Self

Converts to this type from the input type.

impl From<Field> for ModelProjection

fn from(f: Field) -> Self

Converts to this type from the input type.

impl From<FieldSelection> for ModelProjection

fn from(fs: FieldSelection) -> Self

Converts to this type from the input type.

impl IntoIterator for ModelProjection

type Item = Field

The type of the elements being iterated over.

type IntoIter = IntoIter<<ModelProjection as IntoIterator>::Item>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl PartialEq for ModelProjection

fn eq(&self, other: &ModelProjection) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl ScalarCompare for ModelProjection

fn is_in<T>(&self, values: T) -> Filterwhere T: Into<ConditionListValue>,

Field is in a given value

fn not_in<T>(&self, values: T) -> Filterwhere T: Into<ConditionListValue>,

Field is not in a given value

fn equals<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field equals the given value.

fn not_equals<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field does not equal the given value.

fn contains<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field contains the given value.

fn not_contains<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field does not contain the given value.

fn starts_with<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field starts with the given value.

fn not_starts_with<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field does not start with the given value.

fn ends_with<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field ends with the given value.

fn not_ends_with<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field does not end with the given value.

fn less_than<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field is less than the given value.

fn less_than_or_equals<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field is less than or equals the given value.

fn greater_than<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field is greater than the given value.

fn greater_than_or_equals<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

Field is greater than or equals the given value.

fn search<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

fn not_search<T>(&self, val: T) -> Filterwhere T: Into<ConditionValue>,

fn is_set(&self, val: bool) -> Filter

impl StructuralPartialEq for ModelProjection