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Crecto::Repo::Query

Last updated 4 months ago
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The Query class provides building robust composable query builder for retrieving and manipulate data.

Generally (but not necessary), its easiest to define a shortcut variable at the top level of your application.

Query = Crecto::Repo::Query

The query object can be composed and manipulated before being used.

query = Query.new
query = query.where(is_admin: true) if role === "admin"
query = query.where(is_user: true) if role === "user"
Repo.all(User, query)

Query methods

where

Query.where(name: "Aaliyah").where(is_admin: false)

or_where

Query.where(role: "admin").or_where(role: "user")

select

Query.select(["id", "name"])

limit

Query.where(name: "Usher").limit(10)

offset

Query.where(name: "Aretha").limit(10).offset(10)

order_by

Query.order_by("created_at DESC")

join

# SELECT * FROM users INNER JOIN images ON images.user_id = users.id
# WHERE images.file_name = ?
class User
  # schema ...
  has_many :images
end
​
class Image
  schema "images" do
    field :file_name
  end
​
  belogns_to :user
end
query = Query.join(:images).where("images.file_name = ?", "crystal.jpg")
Repo.all(User, query)

distinct

Query.distinct("users.name")

group_by

Query.where(name: "Charlize").join(:posts).group_by("users.id")

preload

Query.preload(:images)
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