Purpose/add store #14
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If an object is passed in that implements a "from_complete_row" method, and the query results are complete - i.e. all columns in the underlying table (via fq_table_name) are in the resulting records - this mode uses the +into+ object's +from_complete_row+ method to convert the records. This mode is used by Simple::Store. If the records are not complete, and contain more than a single value this mode behaves like <tt>:immutable</tt>, i.e. they are read only. If the records are not complete and contain only a single value this mode returns that value for each record.
Simple::Store allows to easily define object “types”. A typical use case could look like this:
```
# This file is loaded when running bin/console.
Simple::SQL.exec <<~SQL
CREATE SCHEMA IF NOT EXISTS store;
CREATE TABLE IF NOT EXISTS store.organizations (
id SERIAL PRIMARY KEY,
name VARCHAR
);
CREATE TABLE IF NOT EXISTS store.users (
id SERIAL PRIMARY KEY,
organization_id INTEGER REFERENCES store.organizations (id),
role_id INTEGER,
first_name VARCHAR,
last_name VARCHAR,
metadata JSONB,
created_at timestamp,
updated_at timestamp
);
SQL
Simple::Store.ask "DELETE FROM store.users"
Simple::Store.ask "DELETE FROM store.organizations"
Simple::Store::Metamodel.register "User", table_name: "store.users" do
attribute :full_name, kind: :virtual
end
Simple::Store::Metamodel.register_virtual_attributes "User" do
def full_name(user)
"#{user.first_name} #{user.last_name}"
end
end
Simple::Store::Metamodel.register "Organization", table_name: "store.organizations" do
attribute :city, writable: false
end
user = Simple::Store.create! "User", first_name: "foo"
p user
# -> <User#33: created_at: 2018-11-28 09:52:37 +0100, first_name: "foo", full_name: "foo ", last_name: nil, organization_id: nil, role_id: nil, updated_at: 2018-11-28 09:52:37 +0100>
```
This is according to the “simple/sql Properly deal w/incomplete models, w/custom type converters” commit in Simple::SQL
Virtual attributes are resolved via method_missing.
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… , options ] Also changes the default text type from :text to :string
After all this method meeds knowledge of the Storage backend (i.e. the Database.)
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