質問編集履歴
2
postとtagを追記
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -51,3 +51,65 @@
|
|
|
51
51
|
end
|
|
52
52
|
|
|
53
53
|
```
|
|
54
|
+
|
|
55
|
+
|
|
56
|
+
|
|
57
|
+
```
|
|
58
|
+
|
|
59
|
+
class Post < ApplicationRecord
|
|
60
|
+
|
|
61
|
+
has_many :tag_maps, dependent: :destroy
|
|
62
|
+
|
|
63
|
+
has_many :tags, through: :tag_maps
|
|
64
|
+
|
|
65
|
+
|
|
66
|
+
|
|
67
|
+
def save_posts(savepost_tags)
|
|
68
|
+
|
|
69
|
+
current_tags = self.tags.pluck(:name) unless self.tags.nil?
|
|
70
|
+
|
|
71
|
+
old_tags = current_tags - savepost_tags
|
|
72
|
+
|
|
73
|
+
new_tags = savepost_tags - current_tags
|
|
74
|
+
|
|
75
|
+
|
|
76
|
+
|
|
77
|
+
# Destroy old taggings:
|
|
78
|
+
|
|
79
|
+
old_tags.each do |old_name|
|
|
80
|
+
|
|
81
|
+
self.tags.delete Tag.find_by(name:old_name)
|
|
82
|
+
|
|
83
|
+
end
|
|
84
|
+
|
|
85
|
+
|
|
86
|
+
|
|
87
|
+
# Create new taggings:
|
|
88
|
+
|
|
89
|
+
new_tags.each do |new_name|
|
|
90
|
+
|
|
91
|
+
post_tag = Tag.find_or_create_by(name:new_name)
|
|
92
|
+
|
|
93
|
+
self.tags << post_tag
|
|
94
|
+
|
|
95
|
+
end
|
|
96
|
+
|
|
97
|
+
end
|
|
98
|
+
|
|
99
|
+
end
|
|
100
|
+
|
|
101
|
+
```
|
|
102
|
+
|
|
103
|
+
```
|
|
104
|
+
|
|
105
|
+
class Tag < ApplicationRecord
|
|
106
|
+
|
|
107
|
+
validates :name,presence:true,length:{maximum:50}
|
|
108
|
+
|
|
109
|
+
has_many :posts, through: :tag_maps
|
|
110
|
+
|
|
111
|
+
has_many :tag_maps, dependent: :destroy
|
|
112
|
+
|
|
113
|
+
end
|
|
114
|
+
|
|
115
|
+
```
|
1
tag_mapのmodel記述
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -33,3 +33,21 @@
|
|
|
33
33
|
|
|
34
34
|
|
|
35
35
|
kaminariで抽出するpostに条件をつけたい場合、どうすればいいんでしょうか？
|
|
36
|
+
|
|
37
|
+
|
|
38
|
+
|
|
39
|
+
```
|
|
40
|
+
|
|
41
|
+
class TagMap < ApplicationRecord
|
|
42
|
+
|
|
43
|
+
belongs_to :post
|
|
44
|
+
|
|
45
|
+
belongs_to :tag
|
|
46
|
+
|
|
47
|
+
validates :post_id,presence:true
|
|
48
|
+
|
|
49
|
+
validates :tag_id,presence:true
|
|
50
|
+
|
|
51
|
+
end
|
|
52
|
+
|
|
53
|
+
```
|