  We report a systematic crystal growth and characterization of
Ca$_{1-y}$La$_{y}$Fe$_{1-x}$Ni$_{x}$As$_{2}$, the newly discovered 112-type
iron-based superconductor. After substituting Fe by a small amount of Ni, bulk
superconductivity is successfully obtained in high quality single crystals
sized up to 6 mm. Resistivity measurements indicate common features for
transport properties in this 112-type iron pnictide, suggest strong scattering
from chemical dopants. Together with the superconducting transition temperature
$T_c$, and the Neel temperature $T_N$ determined by the elastic neutron
scattering, we sketch a three-dimensional phase diagram in the combination of
both Ni and La dopings.
