Python 数据库ER关系图未显示关系，即使已指定

我已经创建了一个sqlite数据库。尽管我已经包括了主键和外键之间的关系，但当我生成ER图时，我无法看到它们之间的连接。我正在使用datagrip创建图表。我在datagrip和dbvisualizer中测试了其他数据库，我对它们没有任何问题，只是在这方面

ER图-

这是我用来在数据库中创建两个表的脚本-

def create_titles_table():
    # connect to the database
    conn = sqlite3.connect("imdb.db")
    # create a cursor
    c = conn.cursor()

    print()
    print("Creating titles table...")
    c.execute(
        """CREATE TABLE IF NOT EXISTS titles
                (titleId  TEXT NOT NULL, titleType  TEXT, 
                primaryTitle  TEXT, originalTitle  TEXT,
                isAdult  INTEGER, startYear  REAL, 
                endYear  REAL, runtimeMinutes REAL,
                PRIMARY KEY (titleId)
                )
    """
    )
    # commit changes
    conn.commit()

    # read the title data
    df = load_data("title.basics.tsv")
    # replace \N with nan
    df.replace("\\N", np.nan, inplace=True)
    # rename columns
    df.rename(columns={"tconst": "titleId"}, inplace=True)
    # drop the genres column
    title_df = df.drop("genres", axis=1)
    # convert the data types from str to numeric
    title_df["startYear"] = pd.to_numeric(title_df["startYear"], errors="coerce")
    title_df["endYear"] = pd.to_numeric(title_df["endYear"], errors="coerce")
    title_df["runtimeMinutes"] = pd.to_numeric(
        title_df["runtimeMinutes"], errors="coerce"
    )

    # insert the data into titles table
    title_df.to_sql("titles", conn, if_exists="replace", index=False)

    # commit changes
    conn.commit()
    # close the connection
    conn.close()
    print("Completed!")
    print()


def create_ratings_table():
# connect to the database
conn = sqlite3.connect("imdb.db")
# create a cursor
c = conn.cursor()

print()
print("Creating ratings table...")
c.execute(
    """CREATE TABLE IF NOT EXISTS ratings 
            (titleId  TEXT NOT NULL, averageRating  REAL, numVotes  INTEGER,
            FOREIGN KEY (titleId) REFERENCES titles(titleId)
            )
"""
)
# commit changes
conn.commit()

# read the data
df = load_data("title.ratings.tsv")
df.rename(columns={"tconst": "titleId"}, inplace=True)

# insert the data into the ratings table
df.to_sql("ratings", conn, if_exists="replace", index=False)

# commit changes
conn.commit()
# close the connection
conn.close()
print("Completed!")
print()

---

有人能告诉我哪里出错了吗？

你是如何创建图表的？@mkrieger1我右键单击datagrip中的数据库，然后选择“图表>显示可视化”并从中保存它。