Name: ecto_migrate
Owner: xerions
Description: Automatic migrations for ecto
Created: 2015-03-16 11:22:12.0
Updated: 2018-02-21 07:55:30.0
Pushed: 2016-09-19 12:06:11.0
Homepage: null
Size: 85
Language: Elixir
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Ecto migrate brings automatic migrations to ecto. Instead of defining and writting manuall diffing
from actual model and old model. The ecto_migrate do it for you. It save actual represantation of
a model model in database and checks, if actual model have the same format as saved in database.
To test, use EctoIt (is depended on it for tests purposes):
-S mix
After, it should be possible:
lication.start(:ecto_it)
s EctoIt.Repo
rt Ecto.Query
odule Weather do # is for later at now
e Ecto.Model
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
d
.Migration.Auto.migrate(Repo, Weather)
ther{city: "Berlin", temp_lo: 20, temp_hi: 25} |> Repo.insert
.all(from w in Weather, where: w.city == "Berlin")
Lets redefine the same model in a shell and migrate it
odule Weather do # is for later at now
e Ecto.Model
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
field :wind, :float, default: 0.0
d
.Migration.Auto.migrate(Repo, Weather)
.all(from w in Weather, where: w.city == "Berlin")
Lets use references
odule Post do
e Ecto.Model
hema "posts" do
field :title, :string
field :public, :boolean, default: true
field :visits, :integer
has_many :comments, Comment
d
odule Comment do
e Ecto.Model
hema "comments" do
field :text, :string
belongs_to :post, Post
d
.Migration.Auto.migrate(Repo, Post)
.Migration.Auto.migrate(Repo, Comment)
ecto_migrate also provides additional migrate/3 API. For using with custom source defined models. Example:
odule Taggable do
e Ecto.Model
hema "this is not a valid schema name and it will never be used" do
field :tag_id, :integer
d
odule MyModel do
e Ecto.Model
hema "my_model" do
field :a, :string
has_many :my_model_tags, {"my_model_tags", Taggable}, [foreign_key: :tag_id]
d
Now we can migrate my_model_tags table with:
.Migration.Auto.migrate(Repo, MyModel)
.Migration.Auto.migrate(Repo, Taggable, [for: MyModel])
It will generate and migrate my_model_tags table to the database which will be associated with my_model table.
ecto_migrate has support of indexes:
odule Weather do # is for later at now
e Ecto.Model
e Ecto.Migration.Auto.Index
dex(:city, unique: true)
dex(:prcp)
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
d
If you do not want to use DSL for defining indexes, macro index doing no more, as generate function:
odule Weather do # is for later at now
e Ecto.Model
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
d
f __indexes__ do
[{[:city], [unique: true]},
{[:prpc], []}]
d
odule Weather do # is for later at now
e Ecto.Model
e Ecto.Migration.Auto.Index
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
d
f __attribute_option__(:city), do: [size: 40]
f __attribute_option__(_), do: []
If the same model used by different sources, it is possible to define callback for it
odule Weather do # is for later at now
e Ecto.Model
e Ecto.Migration.Auto.Index
hema "weather" do
field :city
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
d
f __sources__, do: ["weather", "history_weather"]
If you have installed version before 0.3.2, use 0.3.2 or 0.3.3 for upgrading the table, after that it is possible to upgrade higher versions.