/
paper_trail.ex
244 lines (207 loc) · 7.85 KB
/
paper_trail.ex
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
defmodule PaperTrail do
import Ecto.Changeset
alias PaperTrail.Version
alias PaperTrail.RepoClient
defdelegate get_version(record), to: PaperTrail.VersionQueries
defdelegate get_version(model_or_record, id_or_options), to: PaperTrail.VersionQueries
defdelegate get_version(model, id, options), to: PaperTrail.VersionQueries
defdelegate get_versions(record), to: PaperTrail.VersionQueries
defdelegate get_versions(model_or_record, id_or_options), to: PaperTrail.VersionQueries
defdelegate get_versions(model, id, options), to: PaperTrail.VersionQueries
defdelegate get_current_model(version), to: PaperTrail.VersionQueries
@doc """
Inserts a record to the database with a related version insertion in one transaction
"""
def insert(changeset, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil, model_key: :model, version_key: :version]) do
PaperTrail.Multi.new()
|> PaperTrail.Multi.insert(changeset, options)
|> PaperTrail.Multi.commit()
end
@doc """
Same as insert/2 but returns only the model struct or raises if the changeset is invalid.
"""
def insert!(changeset, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil, model_key: :model, version_key: :version]) do
repo = RepoClient.repo()
repo.transaction(fn ->
case RepoClient.strict_mode() do
true ->
version_id = get_sequence_id("versions") + 1
changeset_data =
Map.get(changeset, :data, changeset)
|> Map.merge(%{
id: get_sequence_from_model(changeset) + 1,
first_version_id: version_id,
current_version_id: version_id
})
initial_version =
make_version_struct(%{event: "insert"}, changeset_data, options)
|> repo.insert!
updated_changeset =
changeset
|> change(%{
first_version_id: initial_version.id,
current_version_id: initial_version.id
})
model = repo.insert!(updated_changeset)
target_version = make_version_struct(%{event: "insert"}, model, options) |> serialize()
Version.changeset(initial_version, target_version) |> repo.update!
model
_ ->
model = repo.insert!(changeset)
make_version_struct(%{event: "insert"}, model, options) |> repo.insert!
model
end
end)
|> elem(1)
end
@doc """
Updates a record from the database with a related version insertion in one transaction
"""
def update(changeset, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil]) do
PaperTrail.Multi.new()
|> PaperTrail.Multi.update(changeset, options)
|> PaperTrail.Multi.commit()
end
@doc """
Same as update/2 but returns only the model struct or raises if the changeset is invalid.
"""
def update!(changeset, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil]) do
repo = PaperTrail.RepoClient.repo()
client = PaperTrail.RepoClient
repo.transaction(fn ->
case client.strict_mode() do
true ->
version_data =
changeset.data
|> Map.merge(%{
current_version_id: get_sequence_id("versions")
})
target_changeset = changeset |> Map.merge(%{data: version_data})
target_version = make_version_struct(%{event: "update"}, target_changeset, options)
initial_version = repo.insert!(target_version)
updated_changeset = changeset |> change(%{current_version_id: initial_version.id})
model = repo.update!(updated_changeset)
new_item_changes =
initial_version.item_changes
|> Map.merge(%{
current_version_id: initial_version.id
})
initial_version |> change(%{item_changes: new_item_changes}) |> repo.update!
model
_ ->
model = repo.update!(changeset)
version_struct = make_version_struct(%{event: "update"}, changeset, options)
repo.insert!(version_struct)
model
end
end)
|> elem(1)
end
@doc """
Deletes a record from the database with a related version insertion in one transaction
"""
def delete(struct, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil]) do
PaperTrail.Multi.new()
|> PaperTrail.Multi.delete(struct, options)
|> PaperTrail.Multi.commit()
end
@doc """
Same as delete/2 but returns only the model struct or raises if the changeset is invalid.
"""
def delete!(struct, options \\ [origin: nil, meta: nil, originator: nil, prefix: nil]) do
repo = PaperTrail.RepoClient.repo()
repo.transaction(fn ->
model = repo.delete!(struct, options)
version_struct = make_version_struct(%{event: "delete"}, struct, options)
repo.insert!(version_struct, options)
model
end)
|> elem(1)
end
defp make_version_struct(%{event: "insert"}, model, options) do
originator = PaperTrail.RepoClient.originator()
originator_ref = options[originator[:name]] || options[:originator]
%Version{
event: "insert",
item_type: get_item_type(model),
item_id: get_model_id(model),
item_changes: serialize(model),
originator_id:
case originator_ref do
nil -> nil
_ -> originator_ref |> Map.get(:id)
end,
origin: options[:origin],
meta: options[:meta]
}
|> add_prefix(options[:prefix])
end
defp make_version_struct(%{event: "update"}, changeset, options) do
originator = PaperTrail.RepoClient.originator()
originator_ref = options[originator[:name]] || options[:originator]
%Version{
event: "update",
item_type: get_item_type(changeset),
item_id: get_model_id(changeset),
item_changes: changeset.changes,
originator_id:
case originator_ref do
nil -> nil
_ -> originator_ref |> Map.get(:id)
end,
origin: options[:origin],
meta: options[:meta]
}
|> add_prefix(options[:prefix])
end
defp make_version_struct(%{event: "delete"}, model_or_changeset, options) do
originator = PaperTrail.RepoClient.originator()
originator_ref = options[originator[:name]] || options[:originator]
%Version{
event: "delete",
item_type: get_item_type(model_or_changeset),
item_id: get_model_id(model_or_changeset),
item_changes: serialize(model_or_changeset),
originator_id:
case originator_ref do
nil -> nil
_ -> originator_ref |> Map.get(:id)
end,
origin: options[:origin],
meta: options[:meta]
}
|> add_prefix(options[:prefix])
end
defp get_sequence_from_model(changeset) do
table_name =
case Map.get(changeset, :data) do
nil -> changeset.__struct__.__schema__(:source)
_ -> changeset.data.__struct__.__schema__(:source)
end
get_sequence_id(table_name)
end
defp get_sequence_id(table_name) do
Ecto.Adapters.SQL.query!(RepoClient.repo(), "select last_value FROM #{table_name}_id_seq").rows
|> List.first()
|> List.first()
end
defp serialize(%Ecto.Changeset{data: data}), do: serialize(data)
defp serialize(model) do
relationships = model.__struct__.__schema__(:associations)
Map.drop(model, [:__struct__, :__meta__] ++ relationships)
end
defp add_prefix(changeset, nil), do: changeset
defp add_prefix(changeset, prefix), do: Ecto.put_meta(changeset, prefix: prefix)
defp get_item_type(%Ecto.Changeset{data: data}), do: get_item_type(data)
defp get_item_type(model), do: model.__struct__ |> Module.split() |> List.last()
def get_model_id(%Ecto.Changeset{data: data}), do: get_model_id(data)
def get_model_id(model) do
{_, model_id} = List.first(Ecto.primary_key(model))
case PaperTrail.Version.__schema__(:type, :item_id) do
:integer ->
model_id
_ ->
"#{model_id}"
end
end
end