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Add SQLite function json_type #4401

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Add SQLite function json_type #4401

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252 changes: 252 additions & 0 deletions diesel/src/sqlite/expression/functions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -422,3 +422,255 @@ define_sql_function! {
#[sql_name = "json_pretty"]
fn json_pretty_with_indentation<J: JsonOrNullableJsonOrJsonbOrNullableJsonb + MaybeNullableValue<Text>>(j: J, indentation: Nullable<Text>) -> J::Out;
}

#[cfg(feature = "sqlite")]
define_sql_function! {
/// Returns the "type" of the outermost element of X.
///
/// # Example
///
/// ```rust
/// # include!("../../doctest_setup.rs");
/// #
/// # fn main() {
/// # #[cfg(feature = "serde_json")]
/// # run_test().unwrap();
/// # }
/// #
/// # #[cfg(feature = "serde_json")]
/// # fn run_test() -> QueryResult<()> {
/// # use diesel::dsl::json_type;
/// # use diesel::sql_types::{Json, Jsonb, Nullable};
/// # use serde_json::{json, Value};
/// # let connection = &mut establish_connection();
///
/// let result = diesel::select(json_type::<Json, _>(json!({"a": "b", "c": 1})))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("object".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!([1,2,3])))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("array".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!("abc")))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("text".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!(-123.4)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("real".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!(42)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("integer".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!(true)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("true".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!(false)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("false".to_string(), result);
///
/// let result = diesel::select(json_type::<Json, _>(json!(null)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("null".to_string(), result);
///
/// let result = diesel::select(json_type::<Nullable<Json>, _>(None::<Value>))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
///
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!({"a": "b", "c": 1})))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("object".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!([1,2,3])))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("array".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!("abc")))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("text".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!(-123.4)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("real".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!(42)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("integer".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!(true)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("true".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!(false)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("false".to_string(), result);
///
/// let result = diesel::select(json_type::<Jsonb, _>(json!(null)))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("null".to_string(), result);
///
/// let result = diesel::select(json_type::<Nullable<Jsonb>, _>(None::<Value>))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
/// # Ok(())
/// # }
/// ```
fn json_type<J: JsonOrNullableJsonOrJsonbOrNullableJsonb + MaybeNullableValue<Text>>(j: J) -> J::Out;
}

#[cfg(feature = "sqlite")]
define_sql_function! {
/// Returns the "type" of the element in X that is selected by path P.
/// If the path P in json_type(X,P) selects an element that does not exist in X, then this function returns NULL.
///
/// # Example
///
/// ```rust
/// # include!("../../doctest_setup.rs");
/// #
/// # fn main() {
/// # #[cfg(feature = "serde_json")]
/// # run_test().unwrap();
/// # }
/// #
/// # #[cfg(feature = "serde_json")]
/// # fn run_test() -> QueryResult<()> {
/// # use diesel::dsl::json_type_with_path;
/// # use diesel::sql_types::{Json, Jsonb, Nullable};
/// # use serde_json::{json, Value};
/// # let connection = &mut establish_connection();
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("object".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("array".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[0]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("integer".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[1]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("real".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[2]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("true".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[3]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("false".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[4]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("null".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Json, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[5]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("text".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Nullable<Json>, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[6]"))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
/// let result = diesel::select(json_type_with_path::<Nullable<Json>, _, _>(None::<Value>, None::<&str>))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
///
///
///
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("object".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("array".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[0]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("integer".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[1]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("real".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[2]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("true".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[3]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("false".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[4]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("null".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Jsonb, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[5]"))
/// .get_result::<String>(connection)?;
///
/// assert_eq!("text".to_string(), result);
///
/// let result = diesel::select(json_type_with_path::<Nullable<Jsonb>, _, _>(json!({"a":[2,3.5,true,false,null,"x"]}), "$.a[6]"))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
/// let result = diesel::select(json_type_with_path::<Nullable<Jsonb>, _, _>(None::<Value>, None::<&str>))
/// .get_result::<Option<String>>(connection)?;
///
/// assert!(result.is_none());
///
/// # Ok(())
/// # }
/// ```
#[sql_name = "json_type"]
fn json_type_with_path<J: JsonOrNullableJsonOrJsonbOrNullableJsonb + MaybeNullableValue<Text>>(j: J, path: Nullable<Text>) -> J::Out;
}
10 changes: 10 additions & 0 deletions diesel/src/sqlite/expression/helper_types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,3 +27,13 @@ pub type json_pretty<E> = super::functions::json_pretty<SqlTypeOf<E>, E>;
#[cfg(feature = "sqlite")]
pub type json_pretty_with_indentation<J, I> =
super::functions::json_pretty_with_indentation<SqlTypeOf<J>, J, I>;

/// Return type of [`json_type(json)`](super::functions::json_type())
#[allow(non_camel_case_types)]
#[cfg(feature = "sqlite")]
pub type json_type<J> = super::functions::json_type<SqlTypeOf<J>, J>;

/// Return type of [`json_type_with_path(json, path)`](super::functions::json_type_with_path())
#[allow(non_camel_case_types)]
#[cfg(feature = "sqlite")]
pub type json_type_with_path<J, P> = super::functions::json_type_with_path<SqlTypeOf<J>, J, P>;
4 changes: 4 additions & 0 deletions diesel_derives/tests/auto_type.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -493,6 +493,10 @@ fn sqlite_functions() -> _ {
json_pretty(sqlite_extras::jsonb),
json_pretty_with_indentation(sqlite_extras::json, " "),
json_pretty_with_indentation(sqlite_extras::jsonb, " "),
json_type(sqlite_extras::json),
json_type(sqlite_extras::jsonb),
json_type_with_path(sqlite_extras::json, "$"),
json_type_with_path(sqlite_extras::jsonb, "$"),
)
}

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