Add tables for shopping list and planner

backend/sql/version_1.sql

@@ -151,19 +151,72 @@ CREATE TABLE [Ingredient] (
     [step_id] INTEGER NOT NULL,
 
     [name] TEXT NOT NULL DEFAULT '',
-    [comment] TEXT NOT NULL DEFAULT '',
     [quantity_value] REAL,
     [quantity_unit] TEXT NOT NULL DEFAULT '',
 
+    [comment] TEXT NOT NULL DEFAULT '',
+
     FOREIGN KEY([step_id]) REFERENCES [Step]([id]) ON DELETE CASCADE
 ) STRICT;
 
 CREATE INDEX [Ingredient_order_index] ON [Ingredient]([order]);
 
--- Table not strict because [value] can story any type of data.
-CREATE TABLE [Settings] (
-    [name] TEXT NOT NULL PRIMARY KEY,
-    [value] TEXT NOT NULL
+CREATE TABLE [RecipeScheduled] (
+    [id] INTEGER PRIMARY KEY,
+    [user_id] INTEGER NOT NULL,
+    [recipe_id] INTEGER NOT NULL,
+    [date] TEXT NOT NULL,
+    [servings] INTEGER, -- If NULL use [recipe].[servings].
+
+    FOREIGN KEY([user_id]) REFERENCES [User]([id]) ON DELETE CASCADE,
+    FOREIGN KEY([recipe_id]) REFERENCES [Recipe]([id]) ON DELETE CASCADE
 );
 
-INSERT INTO [Settings] ([name], [value]) VALUES ('new_user_registration_enabled', TRUE);
+CREATE TABLE [ShoppingEntry] (
+    [id] INTEGER PRIMARY KEY,
+    [user_id] INTEGER NOT NULL,
+    -- The linkded ingredient can be deleted or a custom entry can be manually added.
+    -- In both cases [name], [quantity_value] and [quantity_unit] are used to display
+    -- the entry instead of [Ingredient] data.
+    [ingredient_id] INTEGER,
+    [is_checked] INTEGER NOT NULL DEFAULT FALSE,
+
+    [name] TEXT NOT NULL DEFAULT '',
+    [quantity_value] REAL,
+    [quantity_unit] TEXT NOT NULL DEFAULT '',
+    [servings] INTEGER,
+
+    FOREIGN KEY([user_id]) REFERENCES [User]([id]) ON DELETE CASCADE,
+    FOREIGN KEY([ingredient_id]) REFERENCES [Ingredient]([id]) ON DELETE SET NULL
+);
+
+-- When an ingredient is deleted, its values are copied to any shopping entry
+-- that referenced it.
+CREATE TRIGGER [Ingredient_trigger_delete]
+BEFORE DELETE
+ON [Ingredient]
+BEGIN
+    UPDATE [ShoppingEntry]
+    SET
+        [name] = OLD.[name],
+        [quantity_value] = OLD.[quantity_value],
+        [quantity_unit] = OLD.[quantity_unit],
+        [servings] = (
+        	SELECT [servings]
+        	FROM [Recipe]
+        	INNER JOIN [Group] ON [Group].[recipe_id] = [Recipe].[id]
+        	INNER JOIN [Step] ON [Step].[group_id] = [Group].[id]
+        	WHERE [Step].[id] = OLD.[step_id]
+    	)
+    WHERE [ingredient_id] = OLD.[id];
+END;
+
+CREATE TABLE [Settings] (
+    [name] TEXT NOT NULL PRIMARY KEY,
+
+    -- Value can by anything that can be read from a text by
+    -- implementing the trait 'std::str::FromStr'.
+    [value] TEXT NOT NULL
+) STRICT;
+
+INSERT INTO [Settings] ([name], [value]) VALUES ('new_user_registration_enabled', 'true');