Plenty of GraphQL query implementation

Implement query for languages, words, initial implementation for user
query

src/db/mod.rs

@@ -2,14 +2,32 @@ pub mod models;
 pub mod schema;
 
 use self::models::languages::Language;
+use self::models::users::User;
+use self::models::words::Word;
 use diesel::pg::PgConnection;
 use diesel::r2d2::{ConnectionManager, Pool, PooledConnection};
 use dotenvy::dotenv;
 use std::env;
 use tracing::info;
 
+macro_rules! find_element {
+    ($conn:expr,$dsl:ident,$type:ty,$value:expr,$errmsg:expr) => {
+        if let Ok(val) = $conn {
+            $dsl.find($value).first::<$type>(val).map_or_else(
+                |e| {
+                    info!("{}: {:?}", $errmsg, e);
+                    None
+                },
+                Some,
+            )
+        } else {
+            info!("Failed to obtain connection for the database");
+            None
+        }
+    };
+}
+
 use diesel::prelude::*;
-// use diesel::query_dsl::RunQueryDsl;
 
 pub struct Database {
     conn: Pool<ConnectionManager<PgConnection>>,
@@ -17,13 +35,15 @@ pub struct Database {
 
 impl juniper::Context for Database {}
 
-impl Database {
-    pub fn new() -> Self {
+impl Default for Database {
+    fn default() -> Self {
         Self {
             conn: Database::get_connection_pool(),
         }
     }
+}
 
+impl Database {
     pub fn get_connection_pool() -> Pool<ConnectionManager<PgConnection>> {
         dotenv().ok();
         let database_url =
@@ -51,23 +71,73 @@ impl Database {
         })
     }
 
-    pub fn language(&self, name: &str) -> Option<Language> {
-        use self::schema::languages::dsl::languages;
+    pub fn language(&self, name: &str, owner: &str) -> Option<Language> {
+        use self::schema::languages::dsl;
         match &mut self.conn() {
-            Ok(val) => languages
-                .find(name.to_string())
-                .first::<Language>(val)
-                .map_or_else(
-                    |e| {
-                        info!(
-                        "Failed to retrieve language {} from database: {:?}",
-                        name, e
+            Ok(conn) => match dsl::languages
+                .filter(dsl::name.eq(name))
+                .filter(dsl::owner.eq(owner))
+                .first::<Language>(conn)
+            {
+                Ok(val) => Some(val),
+                Err(e) => {
+                    info!("Could not retrieve language {} of user {} from database: {:?}",
+                          name, owner, e);
+                    None
+                }
+            },
+            Err(e) => {
+                info!("Could not connect to the database: {:?}", e);
+                None
+            }
+        }
+    }
+
+    pub fn user(&self, id: &str) -> Option<User> {
+        use self::schema::users::dsl::users;
+        find_element!(
+            &mut self.conn(),
+            users,
+            User,
+            id.to_string(),
+            format!("Failed to retrieve user {} from database", id)
+        )
+    }
+
+    pub fn word_id(&self, id: &str) -> Option<Word> {
+        use self::schema::words::dsl;
+        if let Ok(conn) = &mut self.conn() {
+            match dsl::words.find(id).first::<Word>(conn) {
+                Ok(val) => Some(val),
+                Err(e) => {
+                    info!("Error retrieving {}: {:?}", id, e);
+                    None
+                }
+            }
+        } else {
+            None
+        }
+    }
+
+    pub fn words(&self, language: &str, word: &str) -> Vec<Word> {
+        use self::schema::words::dsl;
+        if let Ok(conn) = &mut self.conn() {
+            match dsl::words
+                .filter(dsl::language.eq(language))
+                .filter(dsl::norm.eq(word))
+                .load::<Word>(conn)
+            {
+                Ok(val) => val,
+                Err(e) => {
+                    info!(
+                        "Error retrieving {} from language {}: {:?}",
+                        word, language, e
                     );
-                        None
-                    },
-                    Some,
-                ),
-            Err(_) => None,
+                    Vec::new()
+                }
+            }
+        } else {
+            Vec::new()
         }
     }
 }

src/db/models/languages.rs

@@ -1,18 +1,28 @@
-use super::super::schema::{langandagents, languages};
+use crate::db::Database;
 use diesel::prelude::*;
 use juniper::GraphQLEnum;
+use tracing::info;
 
-#[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum)]
+use super::super::schema;
+use super::users::User;
+
+use schema::{langandagents, languages};
+
+#[derive(
+    diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum,
+)]
 #[DieselTypePath = "crate::db::schema::sql_types::Release"]
 pub enum Release {
     Public,
-    #[graphql(name="NON_COMMERCIAL")]
+    #[graphql(name = "NON_COMMERCIAL")]
     NonCommercial,
     Research,
     Private,
 }
 
-#[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum)]
+#[derive(
+    diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum,
+)]
 #[DieselTypePath = "crate::db::schema::sql_types::Dictgenre"]
 pub enum DictGenre {
     General,
@@ -24,7 +34,9 @@ pub enum DictGenre {
     Terminology,
 }
 
-#[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum)]
+#[derive(
+    diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum,
+)]
 #[DieselTypePath = "crate::db::schema::sql_types::Agentlanguagerelation"]
 pub enum AgentLanguageRelation {
     Publisher,
@@ -46,21 +58,163 @@ pub struct Language {
     owner: String,
 }
 
-#[juniper::graphql_object]
 impl Language {
-    #[graphql(name = "release")]
+    fn relationship(
+        &self,
+        context: &Database,
+        relationship: AgentLanguageRelation,
+    ) -> Vec<User> {
+        use schema::langandagents::dsl;
+        match &mut context.conn() {
+            Ok(conn) => dsl::langandagents
+                .filter(dsl::language.eq(self.name.clone()))
+                .filter(dsl::relationship.eq(relationship))
+                .load::<LangAndAgent>(conn)
+                .unwrap()
+                .iter()
+                .map(|v| {
+                    use schema::users::dsl;
+                    dsl::users.find(v.agent.clone()).first::<User>(conn)
+                })
+                .filter_map(|author| match author {
+                    Ok(val) => Some(val),
+                    Err(e) => {
+                        info!(
+                            "Failed ot retrieve author from database: {:?}",
+                            e
+                        );
+
+                        None
+                    }
+                })
+                .collect::<Vec<User>>(),
+            Err(e) => {
+                panic!("Could not connect to the database: {:?}", e);
+            }
+        }
+    }
+}
+
+#[juniper::graphql_object(Context = Database)]
+impl Language {
+    #[graphql(
+        description = "Name in the main target language (often English) of the described language"
+    )]
+    fn name(&self) -> String {
+        self.name.clone()
+    }
+
+    #[graphql(description = "Native name of the language")]
+    fn native() -> Option<String> {
+        self.native.clone()
+    }
+
+    #[graphql(description = "How the dictionary is currently released")]
     fn release(&self) -> Release {
         self.release.clone()
     }
 
-    #[graphql(name = "created")]
+    #[graphql(
+        name = "targetLanguage",
+        description = "Languages in which the current language is translated"
+    )]
+    fn target_language(&self, context: &Database) -> Vec<Language> {
+        use schema::languages::dsl;
+        match &mut context.conn() {
+            Ok(conn) => self
+                .targetlanguage
+                .clone()
+                .into_iter()
+                .flatten()
+                .map(|l| dsl::languages.find(l).first::<Language>(conn))
+                .filter_map(|l| match l {
+                    Ok(language) => Some(language),
+                    Err(e) => {
+                        info!(
+                            "Failed to retrieve language from database: {:?}",
+                            e
+                        );
+                        None
+                    }
+                })
+                .collect::<Vec<Language>>(),
+            Err(e) => {
+                info!("Failed to connect to the database: {:?}", e);
+                Vec::new()
+            }
+        }
+    }
+
+    #[graphql(description = "What kind of dictionary this is")]
+    fn genre(&self) -> Vec<DictGenre> {
+        self.genre.clone().into_iter().flatten().collect()
+    }
+
+    #[graphql(
+        name = "abstract",
+        description = "Short description of the language"
+    )]
+    fn abstract_(&self) -> Option<String> {
+        self.abstract_.clone()
+    }
+
+    #[graphql(
+        description = "Time at which the language's dictionary was created"
+    )]
     fn created(&self) -> String {
         self.created.to_string()
     }
 
-    #[graphql(name = "name")]
-    fn name(&self) -> String {
-        self.name.clone()
+    #[graphql(
+        description = "Longer description of the language, its content can be formatted as Markdown"
+    )]
+    fn description(&self) -> Option<String> {
+        self.description.clone()
+    }
+
+    #[graphql(
+        description = "Copyrights held by various people over the language's dictionary and its content"
+    )]
+    fn rights(&self) -> Option<String> {
+        self.rights.clone()
+    }
+
+    #[graphql(description = "License under which the dictionary is released")]
+    fn license(&self) -> Option<String> {
+        self.license.clone()
+    }
+
+    #[graphql(
+        description = "User with administrative rights over the language"
+    )]
+    fn owner(&self, context: &Database) -> User {
+        use schema::users::dsl;
+        match &mut context.conn() {
+            Ok(conn) => dsl::users
+                .find(self.owner.clone())
+                .first::<User>(conn)
+                .unwrap_or_else(|e| {
+                    panic!(
+                        "Failed to retrieve owner {} of language {}: {:?}",
+                        self.owner, self.name, e
+                    )
+                }),
+            Err(e) => panic!("Failed to connect to the database: {:?}", e),
+        }
+    }
+
+    #[graphql(
+        description = "People who participate in the elaboration of the language's dictionary"
+    )]
+    fn authors(&self, context: &Database) -> Vec<User> {
+        self.relationship(context, AgentLanguageRelation::Author)
+    }
+
+    #[graphql(
+        description = "People who can and do redistribute the language's dictionary"
+    )]
+    fn publishers(&self, context: &Database) -> Vec<User> {
+        self.relationship(context, AgentLanguageRelation::Publisher)
     }
 }
 
@@ -70,4 +224,5 @@ pub struct LangAndAgent {
     id: i32,
     agent: String,
     language: String,
+    relationship: AgentLanguageRelation,
 }

src/db/models/users.rs

@@ -1,5 +1,7 @@
-use diesel::prelude::*;
 use super::super::schema::{userfollows, users};
+use diesel::prelude::*;
+
+use crate::db::Database;
 
 #[derive(Queryable, Insertable, Debug, Clone, PartialEq, Eq)]
 pub struct User {
@@ -7,14 +9,34 @@ pub struct User {
     pub username: String,
 }
 
-#[juniper::graphql_object]
+#[juniper::graphql_object(Context = Database)]
 impl User {
-    pub fn id(&self) -> &str {
-        self.id.as_str()
+    #[graphql(description = "Appwrite ID of the user")]
+    pub fn id(&self) -> String {
+        self.id.clone()
     }
 
-    pub fn username(&self) -> &str {
-        self.username.as_str()
+    #[graphql(description = "The user's apparent name")]
+    pub fn username(&self) -> String {
+        self.username.clone()
+    }
+
+    #[graphql(description = "Who the user follows")]
+    pub fn following(&self, context: &Database) -> Vec<User> {
+        use super::super::schema::{userfollows, users};
+        let conn = &mut context.conn().unwrap();
+        userfollows::dsl::userfollows
+            .filter(userfollows::dsl::follower.eq(self.id.clone()))
+            .load::<UserFollow>(conn)
+            .unwrap()
+            .iter()
+            .map(|f| {
+                users::dsl::users
+                    .find(f.following.clone())
+                    .first::<User>(conn)
+                    .unwrap()
+            })
+            .collect::<Vec<User>>()
     }
 }
 

src/db/models/words.rs

@@ -1,5 +1,11 @@
-use super::super::schema::{wordrelation, words};
+use super::super::schema;
+use crate::db::Database;
 use diesel::prelude::*;
+use juniper::GraphQLEnum;
+use schema::{wordrelation, words};
+use tracing::info;
+
+use super::languages::Language;
 
 #[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq)]
 #[DieselTypePath = "crate::db::schema::sql_types::Wordrelationship"]
@@ -8,13 +14,14 @@ pub enum WordRelationship {
     Related,
 }
 
-#[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq)]
+#[derive(diesel_derive_enum::DbEnum, Debug, Clone, PartialEq, Eq, GraphQLEnum)]
 #[DieselTypePath = "crate::db::schema::sql_types::Partofspeech"]
 pub enum PartOfSpeech {
     Adjective,
     Adposition,
     Adverb,
     Auxilliary,
+    #[graphql(name = "COORDINATING_CONJUNCTION")]
     CoordConj,
     Determiner,
     Interjection,
@@ -22,8 +29,10 @@ pub enum PartOfSpeech {
     Numeral,
     Particle,
     Pronoun,
+    #[graphql(name = "PROPER_NOUN")]
     ProperNoun,
     Punctuation,
+    #[graphql(name = "SUBORDINATING_CONJUNCTION")]
     SubjConj,
     Symbol,
     Verb,
@@ -46,6 +55,136 @@ pub struct Word {
     morphology: Option<String>,
 }
 
+impl Word {
+    fn relationship(&self, context: &Database, relationship: WordRelationship) -> Vec<Word> {
+        use schema::wordrelation::dsl;
+        match &mut context.conn() {
+            Ok(conn) => {
+                dsl::wordrelation
+                    .filter(dsl::wordsource.eq(self.norm.clone()))
+                    .filter(dsl::relationship.eq(relationship))
+                    .load::<WordRelation>(conn)
+                    .unwrap()
+                    .into_iter()
+                    .flat_map(|w| {
+                        use schema::words::dsl;
+                        dsl::words.find(w.wordtarget).first::<Word>(conn)
+                    })
+                    .collect::<Vec<Word>>()
+            },
+            Err(e) => {
+                info!("Could not connect to database: {:?}", e);
+                Vec::new()
+            }
+        }
+    }
+
+}
+
+#[juniper::graphql_object(Context = Database)]
+impl Word {
+    #[graphql(description = "Normal form of the word")]
+    fn norm(&self) -> String {
+        self.norm.clone()
+    }
+
+    #[graphql(description = "Native representation of the word")]
+    fn native(&self) -> Option<String> {
+        self.native.clone()
+    }
+
+    #[graphql(description = "Base form of the current word")]
+    fn lemma(&self, context: &Database) -> Option<Word> {
+        use schema::words::dsl;
+        match self.lemma.clone() {
+            Some(lemma) => match &mut context.conn() {
+                Ok(conn) => match dsl::words.find(lemma.clone()).first::<Word>(conn) {
+                    Ok(word) => Some(word),
+                    Err(e) => {
+                        info!(
+                            "Failed to retrieve lemma {} of word {}: {:?}",
+                            lemma, self.norm, e
+                        );
+                        None
+                    }
+                },
+                Err(e) => {
+                    info!("Could not connect to the database: {:?}", e);
+                    None
+                }
+            },
+            None => None,
+        }
+    }
+
+    #[graphql(description = "Language to which the word belongs")]
+    fn language(&self, context: &Database) -> Language {
+        use schema::languages::dsl;
+        match &mut context.conn() {
+            Ok(conn) => {
+                match dsl::languages
+                    .find(self.language.clone())
+                    .first::<Language>(conn)
+                {
+                    Ok(lang) => lang,
+                    Err(e) => {
+                        panic!("Failed to retrieve language {} of word {} from database: {:?}",
+                               self.language, self.norm, e
+                        )
+                    }
+                }
+            }
+            Err(e) => panic!("Failed to connect to database: {:?}", e),
+        }
+    }
+
+    #[graphql(name = "partOfSpeech", description = "Part of speech the word belongs to")]
+    fn part_of_speech(&self) -> PartOfSpeech {
+        self.partofspeech.clone()
+    }
+
+    #[graphql(description = "Link to an audio file related to the word")]
+    fn audio(&self) -> Option<String> {
+        self.audio.clone()
+    }
+
+    #[graphql(description = "Link to an video file related to the word")]
+    fn video(&self) -> Option<String> {
+        self.video.clone()
+    }
+
+    #[graphql(description = "Link to an image file related to the word")]
+    fn image(&self) -> Option<String> {
+        self.image.clone()
+    }
+
+    #[graphql(description = "Etymology of the word, can be in Markdown format")]
+    fn etymology(&self) -> Option<String> {
+        self.etymology.clone()
+    }
+
+    #[graphql(description = "Usage of the word, can be in Markdown format")]
+    fn usage(&self) -> Option<String> {
+        self.lusage.clone()
+    }
+
+
+    #[graphql(description = "Morphology of the word, can be in Markdown format")]
+    fn morphology(&self) -> Option<String> {
+        self.morphology.clone()
+    }
+
+    #[graphql(name = "related", description = "Words related to the current word")]
+    fn related_words(&self, context: &Database) -> Vec<Word> {
+        self.relationship(context, WordRelationship::Related)
+    }
+
+    #[graphql(name = "definitions", description = "Words that define the current word")]
+    fn definitions(&self, context: &Database) -> Vec<Word> {
+        self.relationship(context, WordRelationship::Definition)
+    }
+}
+
 #[derive(Queryable, Insertable, Debug, Clone, PartialEq, Eq)]
 #[diesel(table_name = wordrelation)]
 pub struct WordRelation {

src/graphql.rs

@@ -4,7 +4,7 @@ use rocket::State;
 use juniper::EmptySubscription;
 use juniper_rocket::{GraphQLRequest, GraphQLResponse};
 
-use crate::db::models::languages::Language;
+use crate::db::models::{languages::Language, users::User, words::Word};
 use crate::db::Database;
 
 #[derive(Debug)]
@@ -17,8 +17,32 @@ impl Query {
         context.all_languages().unwrap()
     }
 
-    fn language(context: &Database, name: String) -> Option<Language> {
-        context.language(name.as_str())
+    #[graphql(
+        description = "Retrieve a specific language from its name and its owner's id"
+    )]
+    fn language(
+        context: &Database,
+        name: String,
+        owner: String,
+    ) -> Option<Language> {
+        context.language(name.as_str(), owner.as_str())
+    }
+
+    #[graphql(description = "Retrieve a specific user from its id")]
+    fn user(context: &Database, id: String) -> Option<User> {
+        context.user(id.as_str())
+    }
+
+    #[graphql(description = "Retrieve a specific word from its id")]
+    fn word(context: &Database, id: String) -> Option<Word> {
+        context.word_id(id.as_str())
+    }
+
+    #[graphql(
+        description = "Retrieve all words with a set normal form from a set language"
+    )]
+    fn words(context: &Database, language: String, word: String) -> Vec<Word> {
+        context.words(language.as_str(), word.as_str())
     }
 }
 
@@ -31,7 +55,8 @@ impl Mutation {
     }
 }
 
-type Schema = juniper::RootNode<'static, Query, Mutation, EmptySubscription<Database>>;
+type Schema =
+    juniper::RootNode<'static, Query, Mutation, EmptySubscription<Database>>;
 
 pub fn create_schema() -> Schema {
     Schema::new(Query {}, Mutation {}, EmptySubscription::default())
@@ -57,7 +82,7 @@ pub async fn get_graphql_handler(
 pub fn post_graphql_handler(
     context: &State<Database>,
     request: GraphQLRequest,
-    schema: &State<Schema>
+    schema: &State<Schema>,
 ) -> GraphQLResponse {
     request.execute_sync(schema, context)
 }

src/main.rs

@@ -60,7 +60,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     #[allow(clippy::let_underscore_drop, clippy::no_effect_underscore_binding)]
     let _ = rocket::build()
         .attach(cors)
-        .manage(db::Database::new())
+        .manage(db::Database::default())
         .manage(create_schema())
         .mount(
             "/",