repo: add some sql for events

README.md

@@ -421,7 +421,7 @@ The following basic use cases are to be implemented at the first time.
 
 - [X] A user signs up
 - [X] A user logs in
-- [] A user lists their events (pagination)
+- [X] A user lists their events (pagination)
 - [] A user sees the detail of an event (description, members, amount)
 - [] A user sees the expenses of an event (total amount, personal expenses, pagination)
 - [] A user sees the detail of an expense: (time, amount, payers, recipients)
@@ -430,7 +430,7 @@ The following basic use cases are to be implemented at the first time.
 - [] A user deletes an expense (may handle some extra access control)
 - [] A user restore a deleted expense
 - [] A user can pay the debt to other members
-- [X] A user creates an event
+- [X] A user creates an event (and participate to it)
 - [] A user updates the event info
 - [] A user invites another user by sending a mail with a token.
 - [] A user joins an event by accepting an invitation
@@ -449,3 +449,40 @@ work on other aspects. For example:
 - ex. Trip journal...
 
 Stop dreaming... Just do the simple stuff first!
+
+### 2024/10/18
+
+I spent some time to figure out this one! But I don't actually need it for now.
+So I just keep it here:
+
+```SQL
+SELECT
+    e.id,
+    e.name,
+    e.description,
+    e.created_at,
+    json_build_object(
+        'id', o.id,
+        'first_name', o.first_name,
+        'last_name', o.last_name
+    ) AS owner,
+    json_agg(
+        json_build_object(
+            'id', u.id,
+            'first_name', u.first_name,
+            'last_name', u.last_name
+        )
+    ) AS users  -- Aggregation for users in the event
+FROM "event" e
+JOIN "participation" p ON p.event_id = e.id  -- participation linked with the event
+JOIN "user" u ON u.id = p.user_id            -- and the query user
+JOIN "user" o ON o.id = e.owner_id           -- get the owner info
+WHERE e.id IN (
+    SELECT pt.event_id FROM participation pt WHERE pt.user_id = $1
+    -- consider the events participated by user_id
+)
+GROUP BY
+    e.id, e.name, e.description, e.created_at,
+    o.id, o.first_name, o.last_name;
+
+```

internal/howmuch/adapter/repo/sqlc/event.sql

@@ -0,0 +1,58 @@
+-- name: InsertEvent :one
+INSERT INTO "event" (
+    name, description, total_amount, default_currency, owner_id, created_at, updated_at
+) VALUES ( $1, $2, $3, $4, $5, $6, $7 )
+RETURNING *;
+
+-- name: ListEventsByUserID :many
+SELECT
+    e.id,
+    e.name,
+    e.description,
+    e.created_at,
+    json_build_object(
+        'id', o.id,
+        'first_name', o.first_name,
+        'last_name', o.last_name
+    ) AS owner
+FROM "event" e
+JOIN "participation" p ON p.event_id = e.id  -- participation linked with the event
+JOIN "user" o ON o.id = e.owner_id           -- get the owner info
+WHERE e.id IN (
+    SELECT pt.event_id FROM participation pt WHERE pt.user_id = $1 -- consider the events participated by user_id
+)
+GROUP BY
+    e.id, e.name, e.description, e.created_at,
+    o.id, o.first_name, o.last_name;
+
+-- name: GetEventByID :one
+SELECT
+    e.id,
+    e.name,
+    e.description,
+    e.total_amount,
+    e.default_currency,
+    e.created_at,
+    e.updated_at,
+    json_build_object(
+        'id', o.id,
+        'first_name', o.first_name,
+        'last_name', o.last_name
+    ) AS owner,
+    json_agg(
+        json_build_object(
+            'id', u.id,
+            'first_name', u.first_name,
+            'last_name', u.last_name
+        )
+    ) AS users  -- Aggregation for users in the event
+FROM "event" e
+JOIN "participation" p ON p.event_id = e.id  -- participation linked with the event
+JOIN "user" u ON u.id = p.user_id            -- and the query user
+JOIN "user" o ON o.id = e.owner_id           -- get the owner info
+WHERE e.id = $1
+GROUP BY
+    e.id, e.name, e.description, e.created_at, e.updated_at,
+    e.total_amount, e.default_currency,
+    o.id, o.first_name, o.last_name;
+

internal/howmuch/adapter/repo/sqlc/event.sql.go

@@ -0,0 +1,174 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.27.0
+// source: event.sql
+
+package sqlc
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"time"
+)
+
+const getEventByID = `-- name: GetEventByID :one
+SELECT
+    e.id,
+    e.name,
+    e.description,
+    e.total_amount,
+    e.default_currency,
+    e.created_at,
+    e.updated_at,
+    json_build_object(
+        'id', o.id,
+        'first_name', o.first_name,
+        'last_name', o.last_name
+    ) AS owner,
+    json_agg(
+        json_build_object(
+            'id', u.id,
+            'first_name', u.first_name,
+            'last_name', u.last_name
+        )
+    ) AS users  -- Aggregation for users in the event
+FROM "event" e
+JOIN "participation" p ON p.event_id = e.id  -- participation linked with the event
+JOIN "user" u ON u.id = p.user_id            -- and the query user
+JOIN "user" o ON o.id = e.owner_id           -- get the owner info
+WHERE e.id = $1
+GROUP BY
+    e.id, e.name, e.description, e.created_at, e.updated_at,
+    e.total_amount, e.default_currency,
+    o.id, o.first_name, o.last_name
+`
+
+type GetEventByIDRow struct {
+	ID              int32
+	Name            string
+	Description     sql.NullString
+	TotalAmount     sql.NullInt32
+	DefaultCurrency string
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
+	Owner           json.RawMessage
+	Users           json.RawMessage
+}
+
+func (q *Queries) GetEventByID(ctx context.Context, id int32) (GetEventByIDRow, error) {
+	row := q.db.QueryRowContext(ctx, getEventByID, id)
+	var i GetEventByIDRow
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Description,
+		&i.TotalAmount,
+		&i.DefaultCurrency,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.Owner,
+		&i.Users,
+	)
+	return i, err
+}
+
+const insertEvent = `-- name: InsertEvent :one
+INSERT INTO "event" (
+    name, description, total_amount, default_currency, owner_id, created_at, updated_at
+) VALUES ( $1, $2, $3, $4, $5, $6, $7 )
+RETURNING id, name, description, default_currency, owner_id, created_at, updated_at, total_amount
+`
+
+type InsertEventParams struct {
+	Name            string
+	Description     sql.NullString
+	TotalAmount     sql.NullInt32
+	DefaultCurrency string
+	OwnerID         int32
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
+}
+
+func (q *Queries) InsertEvent(ctx context.Context, arg InsertEventParams) (Event, error) {
+	row := q.db.QueryRowContext(ctx, insertEvent,
+		arg.Name,
+		arg.Description,
+		arg.TotalAmount,
+		arg.DefaultCurrency,
+		arg.OwnerID,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	var i Event
+	err := row.Scan(
+		&i.ID,
+		&i.Name,
+		&i.Description,
+		&i.DefaultCurrency,
+		&i.OwnerID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+		&i.TotalAmount,
+	)
+	return i, err
+}
+
+const listEventsByUserID = `-- name: ListEventsByUserID :many
+SELECT
+    e.id,
+    e.name,
+    e.description,
+    e.created_at,
+    json_build_object(
+        'id', o.id,
+        'first_name', o.first_name,
+        'last_name', o.last_name
+    ) AS owner
+FROM "event" e
+JOIN "participation" p ON p.event_id = e.id  -- participation linked with the event
+JOIN "user" o ON o.id = e.owner_id           -- get the owner info
+WHERE e.id IN (
+    SELECT pt.event_id FROM participation pt WHERE pt.user_id = $1 -- consider the events participated by user_id
+)
+GROUP BY
+    e.id, e.name, e.description, e.created_at,
+    o.id, o.first_name, o.last_name
+`
+
+type ListEventsByUserIDRow struct {
+	ID          int32
+	Name        string
+	Description sql.NullString
+	CreatedAt   time.Time
+	Owner       json.RawMessage
+}
+
+func (q *Queries) ListEventsByUserID(ctx context.Context, userID int32) ([]ListEventsByUserIDRow, error) {
+	rows, err := q.db.QueryContext(ctx, listEventsByUserID, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []ListEventsByUserIDRow
+	for rows.Next() {
+		var i ListEventsByUserIDRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.Name,
+			&i.Description,
+			&i.CreatedAt,
+			&i.Owner,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}

internal/howmuch/adapter/repo/sqlc/participation.sql

@@ -0,0 +1,5 @@
+-- name: InsertParticipation :one
+INSERT INTO participation (
+    user_id, event_id, invited_by_user_id, created_at, updated_at
+) VALUES ($1, $2, $3, $4, $5)
+RETURNING *;

internal/howmuch/adapter/repo/sqlc/participation.sql.go

@@ -0,0 +1,47 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.27.0
+// source: participation.sql
+
+package sqlc
+
+import (
+	"context"
+	"database/sql"
+	"time"
+)
+
+const insertParticipation = `-- name: InsertParticipation :one
+INSERT INTO participation (
+    user_id, event_id, invited_by_user_id, created_at, updated_at
+) VALUES ($1, $2, $3, $4, $5)
+RETURNING id, user_id, event_id, invited_by_user_id, created_at, updated_at
+`
+
+type InsertParticipationParams struct {
+	UserID          int32
+	EventID         int32
+	InvitedByUserID sql.NullInt32
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
+}
+
+func (q *Queries) InsertParticipation(ctx context.Context, arg InsertParticipationParams) (Participation, error) {
+	row := q.db.QueryRowContext(ctx, insertParticipation,
+		arg.UserID,
+		arg.EventID,
+		arg.InvitedByUserID,
+		arg.CreatedAt,
+		arg.UpdatedAt,
+	)
+	var i Participation
+	err := row.Scan(
+		&i.ID,
+		&i.UserID,
+		&i.EventID,
+		&i.InvitedByUserID,
+		&i.CreatedAt,
+		&i.UpdatedAt,
+	)
+	return i, err
+}

migrations/20241018175610_participation_add_unique_keys.postgres.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "participation"
+ADD CONSTRAINT unique_user_event UNIQUE ("user_id", "event_id");