Vue.jsのデータプロパティでajax通信によるデータの取得

・やりたい事
flaskのルート関数により'/'でSQLAlchemy使用してデータベースからデータを取得してvue.jsにajax通信でデータを送り
データを表示する。

・問題
エラーは今のところないのですがデータが空っぽです。

python
1class Book(Base):
2    __tablename__ = 'book'
3    id = Column(INTEGER(),primary_key=True)
4    b_n = Column(TEXT())
5    ca = Column(TEXT())
6    book_pic_ad = Column(TEXT())
7    page = Column(INTEGER())
8    impre = Column(TEXT())
9    create =Column(DATETIME())
10    la_id =Column(INTEGER(),ForeignKey('la_na.id'))
11
12    language = relationship('Language')
13
14    def to_dict(self):
15        return{
16            'id':int(self.id),
17            'b_n':str(self.b_n),
18            'ca':str(self.ca),
19            'book_pic_ad':str(self.book_pic_ad),
20            'page':int(self.page),
21            'impre':str(self.impre),
22            'create':str(self.create),
23            'la_id':int(self.la_id),
24            'language':str(self.language.pr_la)
25        }
26
27class Error(Base):
28    __tablename__ = 'error'
29    id = Column(INTEGER(),primary_key=True)
30    la_id = Column(INTEGER(),ForeignKey('la_na.id'))
31    err_na = Column(TEXT())
32    err_body = Column(TEXT())
33    err_de = Column(TEXT())
34    created = Column(DATETIME())
35
36    language = relationship('Language')
37
38    def to_dict(self):
39        return{
40            'id':int(self.id),
41            'la_id':int(self.la_id),
42            'err_na':str(self.err_na),
43            'err_body':str(self.err_body),
44            'err_de':str(self.err_de),
45            'created':str(self.created),
46            'language':str(self.language.pr_la)
47        }
48
49
50class Language(Base):
51    __tablename__ = 'la_na'
52    id = Column(INTEGER(),primary_key=True)
53    pr_la = Column(TEXT())
54
55    def to_dict(self):
56        return{
57            'id':int(self.id),
58            'pr_la':str(self.pr_la)
59        }
60
61
62class ProgTech(Base):
63    __tablename__ = 'prog_tech'
64    id = Column(INTEGER(),primary_key=True)
65    la_id = Column(INTEGER(),ForeignKey('la_na.id'))
66    bo_id = Column(INTEGER(),ForeignKey('book.id'))
67    la_na = Column(TEXT())
68    le_level = Column(INTEGER())
69    la_code = Column(TEXT())
70    explain = Column(TEXT())
71    created = Column(DATETIME())
72
73    book = relationship('Book')
74    language = relationship('Language')
75
76    def to_dict(self):
77        return{
78            'id':int(self.id),
79            'la_id':int(self.la_id),
80            'bo_id':int(self.bo_id),
81            'la_na':str(self.la_na),
82            'le_level':int(self.le_level),
83            'la_code':str(self.la_code),
84            'explain':str(self.explain),
85            'created':str(self.created),
86            'language':str(self.language.pr_la),
87            'book':str(self.book.b_n)
88        }
89#ここまで
90
91def get_by_list(arr):
92    res = []
93    for item in arr:
94        res.append(item.to_dict())
95    return res
96
97@app.route('/',methods=['GET']) #URLの後の数字を基に下記のrender_templateの値を返す。
98def index():
99    return render_template('top_content.html',
100                            title='CHACON',
101                            )
102
103@app.route('/get_list',methods=['POST'])
104def get_data_book():
105    Session = sessionmaker(bind=engine)
106    ses = Session()
107    re1 = ses.query(Book).join(Language).all()
108    all_booK = get_by_list(re1)
109
110    re2 = ses.query(Book).filter(Book.ca == '小説').join(Language).order_by(Book.create.desc())[:20]
111    novel = get_by_list(re2)
112
113    re3 = ses.query(Book).filter(Book.ca == 'IT参考書').join(Language).order_by(Book.create.desc())[:20]
114    it_book = get_by_list(re3)
115
116    re4 = ses.query(Book).filter(Book.ca == 'その他').join(Language).order_by(Book.create.desc())[:20]
117    etc_booK = get_by_list(re4)
118
119    book_list = [all_booK,novel,it_book,etc_booK]
120
121    return jsonify(all_booK )
122

html
1<script>
2            Vue.component('book_show',{
3                template:'#book_show_template',
4                /*コンポーネント内のdataは関数でないといけないのでこの形*/
5                data:function(){
6                    let all_list = [];
7                    this.getMsg();
8                    let all_book_list = this.all_list;
9                    let novel_book_list = [];
10                    let referen_book_list = [];
11                    let etc_book_list = [];
12                    this.getMsg();
13                    return{
14                        all_list,
15                        all_book_list,
16                        novel_book_list,
17                        referen_book_list,
18                        etc_book_list 
19                    
20                    }
21                },
22                methods:{
23                        getMsg:function(){
24                            let self =this;
25                            $.ajax({
26                                type:'POST',
27                                url:'/get_list',
28                                processData:false,
29                                contentType:false,
30                                success:function(data){
31                                    self.all_list = data;
32                                },
33                                error:function(request,status,err){
34                                    
35
36                                }
37                            });
38                        }
39
40                },