refactor: follow clippy recommendation :

- Remove unused constructor for Table & Column
- Add .expect in databases. disconnect
- Remove usedless String::from in column serializer

src/databases/mod.rs

@@ -1,4 +1,4 @@
-use rusqlite::{Connection, Result, Error};
+use rusqlite::{Connection, Result};
 
 pub fn connect(db_connection: String) -> Result<Connection> {
     Connection::open(db_connection)
@@ -8,6 +8,6 @@ pub fn run_command(connection: &Connection, sql: String) -> Result<usize> {
     connection.execute(sql.as_str(), [])
 }
 
-pub fn disconnect(connection: Connection) -> Result<(), (Connection, Error)> {
-    connection.close()
+pub fn disconnect(connection: Connection) {
+    connection.close().expect("Error closing sqlite connection");
 }

src/lib.rs

@@ -26,7 +26,7 @@ impl DbBuilderFacade {
 
         if let Ok(connection) = connection_result {
             run_command(&connection, sql_tables).expect("Failed to execute query");
-            disconnect(connection).expect("Failed to disconnect from sqlite");
+            disconnect(connection);
             Ok(())
         } else {
             Err("Failed to connect to the server".to_string())

src/query_builders/column_sql_serializer.rs

@@ -6,7 +6,7 @@ pub struct ColumnSqlSerializer {}
 
 impl ColumnSqlSerializer {
     pub fn serialize(self, column: Column) -> Result<String, String>  {
-        let mut query = String::from(column.name);
+        let mut query = column.name;
         query.push(' ');
 
         query += &*String::from(column.datatype);

src/schemas/builders.rs

@@ -84,6 +84,12 @@ impl ColumnBuilder {
     }
 }
 
+impl Default for ColumnBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 pub struct TableBuilder {
     name: String,
     columns: Vec<Column>,
@@ -119,6 +125,12 @@ impl TableBuilder {
     }
 }
 
+impl Default for TableBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 #[cfg(test)]
 mod test {
     use crate::mappings::SQLiteDatatypes;

src/schemas/entities.rs

@@ -27,28 +27,3 @@ pub struct Column {
     #[serde(default)]
     pub primary_key: bool
 }
-
-impl Table {
-    pub fn new(name: String, columns: Vec<Column>, strict: bool) -> Table {
-        Table {
-            name,
-            columns,
-            strict
-        }
-    }
-}
-
-impl Column {
-    pub fn new(name: String, datatype: SQLiteDatatypes, nullable: bool, default: Option<String>, auto_increment: bool, unique: bool, check_constraint: Option<String>, primary_key: bool) -> Column {
-        Column {
-            name,
-            datatype,
-            nullable,
-            default,
-            auto_increment,
-            unique,
-            check_constraint,
-            primary_key
-        }
-    }
-}